Canadian Institute for Theoretical Astrophysics / en 茄子直播 alum helps prepare Canadarm3 for lunar orbit /news/u-t-alum-helps-prepare-canadarm3-lunar-orbit <span class="field field--name-title field--type-string field--label-hidden">茄子直播 alum helps prepare Canadarm3 for lunar orbit</span> <div class="field field--name-field-featured-picture field--type-image field--label-hidden field__item"> <img loading="eager" srcset="/sites/default/files/styles/news_banner_370/public/2023-08/Canadarm3--Canada%27s-smart-robotic-system-for-the-Lunar-Gateway-crop.jpg?h=afdc3185&amp;itok=r-de6UBG 370w, /sites/default/files/styles/news_banner_740/public/2023-08/Canadarm3--Canada%27s-smart-robotic-system-for-the-Lunar-Gateway-crop.jpg?h=afdc3185&amp;itok=7x4lFHeV 740w, /sites/default/files/styles/news_banner_1110/public/2023-08/Canadarm3--Canada%27s-smart-robotic-system-for-the-Lunar-Gateway-crop.jpg?h=afdc3185&amp;itok=eQaKc8El 1110w" sizes="(min-width:1200px) 1110px, (max-width: 1199px) 80vw, (max-width: 767px) 90vw, (max-width: 575px) 95vw" width="740" height="494" src="/sites/default/files/styles/news_banner_370/public/2023-08/Canadarm3--Canada%27s-smart-robotic-system-for-the-Lunar-Gateway-crop.jpg?h=afdc3185&amp;itok=r-de6UBG" alt="&quot;&quot;"> </div> <span class="field field--name-uid field--type-entity-reference field--label-hidden"><span>siddiq22</span></span> <span class="field field--name-created field--type-created field--label-hidden"><time datetime="2023-08-14T10:59:08-04:00" title="Monday, August 14, 2023 - 10:59" class="datetime">Mon, 08/14/2023 - 10:59</time> </span> <div class="clearfix text-formatted field field--name-field-cutline-long field--type-text-long field--label-above"> <div class="field__label">Cutline</div> <div class="field__item"><p><em>An artist's rendering of Canadarm3 on the Lunar Gateway (photo by CSA, NASA)</em></p> </div> </div> <div class="field field--name-field-author-reporters field--type-entity-reference field--label-hidden field__items"> <div class="field__item"><a href="/news/authors-reporters/david-goldberg" hreflang="en">David Goldberg</a></div> </div> <div class="field field--name-field-topic field--type-entity-reference field--label-above"> <div class="field__label">Topic</div> <div class="field__item"><a href="/news/topics/our-community" hreflang="en">Our Community</a></div> </div> <div class="field field--name-field-story-tags field--type-entity-reference field--label-hidden field__items"> <div class="field__item"><a href="/news/tags/alumni" hreflang="en">茄子直播</a></div> <div class="field__item"><a href="/news/tags/canadian-institute-theoretical-astrophysics" hreflang="en">Canadian Institute for Theoretical Astrophysics</a></div> <div class="field__item"><a href="/news/tags/dunlap-institute-astronomy-astrophysics" hreflang="en">Dunlap Institute for Astronomy &amp; Astrophysics</a></div> <div class="field__item"><a href="/news/tags/faculty-arts-science" hreflang="en">Faculty of Arts &amp; Science</a></div> <div class="field__item"><a href="/news/tags/space" hreflang="en">Space</a></div> <div class="field__item"><a href="/news/tags/stem" hreflang="en">STEM</a></div> </div> <div class="field field--name-field-subheadline field--type-string-long field--label-above"> <div class="field__label">Subheadline</div> <div class="field__item">Jamil Shariff, a PhD graduate in astrophysics, was inspired by science fiction to explore space and the future of humanity </div> </div> <div class="clearfix text-formatted field field--name-body field--type-text-with-summary field--label-hidden field__item"><p>Since watching <em>Star Trek</em> as a young boy in his parents鈥 living room, University of Toronto alumnus <a href="https://www.cita.utoronto.ca/~jshariff/index.html"><strong>Jamil Shariff</strong></a> has dreamed of exploring strange new worlds&nbsp;鈥 and boldly going where no one has gone before.</p> <p>"Science fiction definitely sparked my interest in what the future of humanity would look like, the exploration of space and the development of amazing new technologies,鈥 says Shariff, who earned his PhD in astrophysics in 2015.</p> <figure role="group" class="caption caption-drupal-media align-left"> <div> <div class="field field--name-field-media-image field--type-image field--label-hidden field__item"> <img loading="lazy" src="/sites/default/files/2023-08/jamil_headshot-crop.jpg" width="250" height="313" alt="&quot;&quot;"> </div> </div> <figcaption><em>Jamil Shariff (supplied image)</em></figcaption> </figure> <p>Formerly a postdoctoral fellow at 茄子直播's <a href="https://www.cita.utoronto.ca/">Canadian Institute for Theoretical Astrophysics</a>, Shariff is now engineering technology for one of the most ambitious projects in the history of crewed space exploration.</p> <p>A senior leader in systems design <a href="https://mda.space/en/">at MDA</a> (the Canadian company famous for building the robotic Canadarm on NASA鈥檚 space shuttle and Canadarm2 aboard the International Space Station), Shariff has been working on Canadarm3, the latest iteration of the iconic space hardware.</p> <p>The new robotic arm is for <a href="https://www.nasa.gov/gateway">Lunar Gateway</a>, a space station planned for lunar orbit by the end of the 2020s. It will serve as a research outpost and cosmic pit stop for future missions to the surfaces of the moon, Mars and beyond.</p> <p>MDA recruited Shariff several years ago, impressed by his PhD research under Professor&nbsp;<a href="https://www.astro.utoronto.ca/people/faculty/name/barth-netterfield/"><strong>Barth Netterfield</strong></a>&nbsp;at the&nbsp;David A. Dunlap department of astronomy and astrophysics in the Faculty of Arts &amp; Science. Netterfield is one of the world鈥檚 foremost experts in developing systems for high-altitude balloon-borne telescopes.</p> <figure role="group" class="caption caption-drupal-media align-right"> <div> <div class="field field--name-field-media-image field--type-image field--label-hidden field__item"> <img loading="lazy" src="/sites/default/files/2023-08/Jamil_startrek-crop.jpg" width="300" height="263" alt="Jamil Shariff watching Star Trek as a young boy"> </div> </div> <figcaption><em>Watching Star Trek as a kid sparked Shariff's interest in space and astrophysics</em><em>&nbsp;(supplied image)</em></figcaption> </figure> <p>鈥淚 wouldn't be where I am now if it weren't for professors like Netterfield,鈥 Shariff says. 鈥淗e鈥檚 a mentor, and it really matters to him if the people in his lab succeed.鈥</p> <p>Part of an international team of researchers, Shariff and Netterfield designed, built, installed and operated two balloon-borne telescopes and analyzed their data. <a href="http://blastexperiment.info/">One of the projects, BLASTPol</a>, examined the role played by magnetic fields in star formation. <a href="http://spider.princeton.edu/">The other, Spider</a>, was focused on understanding what happened in the very first moments after the Big Bang.</p> <p>鈥淭he fact that I helped work on instrumentation that detected those microwave photons&nbsp;鈥 which are like our baby picture of the universe, the oldest signal we can ever detect&nbsp;鈥 that still amazes me,鈥 Shariff says. 鈥淚t's stayed with me all this time.鈥</p> <p>During his PhD, Shariff spent several months&nbsp;working along other scientists at Antarctica鈥檚 <a href="https://www.nsf.gov/geo/opp/support/mcmurdo.jsp">McMurdo Station</a>, maintaining and flying Spider in the skies over one of Earth鈥檚 most desolate locations. The experience&nbsp;鈥 and learning how to explain his work to a wider audience 鈥 prepared Shariff for life after 茄子直播.</p> <p>鈥淚t's important to be able to tell your story&nbsp;鈥 especially if you have a PhD in something like astrophysics&nbsp;鈥 because a recruiter may not exactly understand what you do,鈥 he says. 鈥淭hat really helped me.鈥</p> <p>Nearly a decade after graduating, Shariff remains a champion of astrophysics research and 茄子直播's team of experts.</p> <p>鈥淵ou鈥檝e got some of the best theorists in the world coming to us," Shariff says. 鈥淵ou have theory, observation and experimentation all happening at 茄子直播. I think that should be a compelling case for donors who are passionate about furthering our understanding of the universe."</p> </div> <div class="field field--name-field-news-home-page-banner field--type-boolean field--label-above"> <div class="field__label">News home page banner</div> <div class="field__item">Off</div> </div> Mon, 14 Aug 2023 14:59:08 +0000 siddiq22 302610 at For a billion years, Earth's day lasted just 19.5 hours 聽鈥 a new study reveals why /news/astrophysicists-reveal-why-earths-day-was-constant-over-billion-years <span class="field field--name-title field--type-string field--label-hidden">For a billion years, Earth's day lasted just 19.5 hours &nbsp;鈥 a new study reveals why</span> <div class="field field--name-field-featured-picture field--type-image field--label-hidden field__item"> <img loading="eager" srcset="/sites/default/files/styles/news_banner_370/public/2023-07/GettyImages-1253695426-crop.jpg?h=afdc3185&amp;itok=foydoqYz 370w, /sites/default/files/styles/news_banner_740/public/2023-07/GettyImages-1253695426-crop.jpg?h=afdc3185&amp;itok=1CM88i0w 740w, /sites/default/files/styles/news_banner_1110/public/2023-07/GettyImages-1253695426-crop.jpg?h=afdc3185&amp;itok=osFArm3U 1110w" sizes="(min-width:1200px) 1110px, (max-width: 1199px) 80vw, (max-width: 767px) 90vw, (max-width: 575px) 95vw" width="740" height="494" src="/sites/default/files/styles/news_banner_370/public/2023-07/GettyImages-1253695426-crop.jpg?h=afdc3185&amp;itok=foydoqYz" alt="view of earth from space with the sun shining in the background"> </div> <span class="field field--name-uid field--type-entity-reference field--label-hidden"><span>siddiq22</span></span> <span class="field field--name-created field--type-created field--label-hidden"><time datetime="2023-07-13T12:54:12-04:00" title="Thursday, July 13, 2023 - 12:54" class="datetime">Thu, 07/13/2023 - 12:54</time> </span> <div class="clearfix text-formatted field field--name-field-cutline-long field--type-text-long field--label-above"> <div class="field__label">Cutline</div> <div class="field__item"><p><em>Without the sun鈥檚 pull on the Earth鈥檚 atmosphere, our day would be 60 hours long (photo by&nbsp;dima_zel/Getty images)</em></p> </div> </div> <div class="field field--name-field-author-reporters field--type-entity-reference field--label-hidden field__items"> <div class="field__item"><a href="/news/authors-reporters/chris-sasaki" hreflang="en">Chris Sasaki</a></div> </div> <div class="field field--name-field-topic field--type-entity-reference field--label-above"> <div class="field__label">Topic</div> <div class="field__item"><a href="/news/topics/breaking-research" hreflang="en">Breaking Research</a></div> </div> <div class="field field--name-field-story-tags field--type-entity-reference field--label-hidden field__items"> <div class="field__item"><a href="/news/tags/physical-and-environmental-sciences" hreflang="en">Physical and Environmental Sciences</a></div> <div class="field__item"><a href="/news/tags/astronomy" hreflang="en">Astronomy</a></div> <div class="field__item"><a href="/news/tags/astrophysics" hreflang="en">Astrophysics</a></div> <div class="field__item"><a href="/news/tags/canadian-institute-theoretical-astrophysics" hreflang="en">Canadian Institute for Theoretical Astrophysics</a></div> <div class="field__item"><a href="/news/tags/climate-change" hreflang="en">Climate Change</a></div> <div class="field__item"><a href="/news/tags/faculty-arts-science" hreflang="en">Faculty of Arts &amp; Science</a></div> <div class="field__item"><a href="/news/tags/physics" hreflang="en">Physics</a></div> <div class="field__item"><a href="/news/tags/research-innovation" hreflang="en">Research &amp; Innovation</a></div> <div class="field__item"><a href="/news/tags/u-t-scarborough" hreflang="en">茄子直播 Scarborough</a></div> </div> <div class="field field--name-field-subheadline field--type-string-long field--label-above"> <div class="field__label">Subheadline</div> <div class="field__item">An atmospheric tide driven by the sun countered the effect of the moon, astrophysicists say</div> </div> <div class="clearfix text-formatted field field--name-body field--type-text-with-summary field--label-hidden field__item"><p>A team of astrophysicists from the University of Toronto has revealed how the slow and steady lengthening of Earth鈥檚 day caused by the tidal pull of the moon was halted for over a billion years.</p> <p>They show that from approximately two billion years ago until 600 million years ago, an atmospheric tide driven by the sun countered the effect of the moon, keeping Earth鈥檚 rotational rate steady and the length of day at a constant 19.5 hours.</p> <p>Without this billion-year pause in the slowing of our planet鈥檚 rotation, our current 24-hour day would stretch to over 60 hours.</p> <p>Drawing on geological evidence and using atmospheric research tools, the scientists show that the tidal stalemate between the sun and moon resulted from the incidental but consequential link between the atmosphere鈥檚 temperature and Earth鈥檚 rotational rate.</p> <p>The study was <a href="https://can01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.science.org%2Fdoi%2F10.1126%2Fsciadv.add2499&amp;data=05%7C01%7Cjosslyn.johnstone%40utoronto.ca%7Ce5d4a503473d41530b6208db78bc8829%7C78aac2262f034b4d9037b46d56c55210%7C0%7C0%7C638236523938537572%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&amp;sdata=h9f5hPM0XIIsHiLu9xyld1Hmtw8CzNCnDLrWNJrNylk%3D&amp;reserved=0">published in the journal&nbsp;<em>Science Advances</em></a>.</p> <p>The paper鈥檚 authors include Professor <a href="https://www.cita.utoronto.ca/~murray/"><strong>Norman Murray</strong></a>, a theoretical astrophysicist with the Faculty of Arts &amp; Science鈥檚&nbsp;<a href="https://www.cita.utoronto.ca/">Canadian Institute for Theoretical Astrophysics</a>&nbsp;(CITA); graduate student <a href="https://www.physics.utoronto.ca/members/wu-hanbo/"><strong>Hanbo Wu</strong></a>, with CITA and the <a href="https://www.physics.utoronto.ca/">department of physics</a>; <a href="https://www.utsc.utoronto.ca/physsci/kristen-menou"><strong>Kristen Menou</strong></a>, associate professor in the <a href="https://www.astro.utoronto.ca/">David A. Dunlap department of astronomy and astrophysics</a>&nbsp;and the <a href="https://www.utsc.utoronto.ca/physsci/welcome-physical-environmental-sciences">department of physical and environmental sciences</a> at 茄子直播 Scarborough; <strong>Jeremy Leconte</strong>, a CNRS researcher at the Laboratoire d鈥檃strophysique de Bordeaux and a former CITA postdoctoral fellow; and <strong>Christopher Lee</strong>, assistant professor in the department of physics.</p> <p>&nbsp;</p> <figure role="group" class="caption caption-drupal-media align-left"> <div> <div class="field field--name-field-media-image field--type-image field--label-hidden field__item"> <img loading="lazy" src="/sites/default/files/2023-07/Williams_2000_Reynella_tidal_laminae-crop.jpg" width="300" height="367" alt="&quot;&quot;"> </div> </div> <figcaption><em>Murray and his collaborators relied on geologic evidence in their study, like these samples from a tidal estuary that reveal the cycle of&nbsp;<a href="https://parks.canada.ca/pn-np/nb/fundy/nature/environment/marees-tides/vives-mortes-spring-neap">spring and neap tides</a>. Thick bands correspond to spring tides, and thin bands to neap tides (image by G.E. Williams)</em></figcaption> </figure> <p>When the moon first formed some 4.5 billion years ago, the day was less than 10 hours long. But since then, the moon鈥檚 gravitational pull on the Earth has been slowing our planet鈥檚 rotation, resulting in an increasingly longer day. Today, it continues to lengthen at a rate of some 1.7 milliseconds every century.</p> <p>The moon slows the planet鈥檚 rotation by pulling on Earth鈥檚 oceans, creating tidal bulges on opposite sides of the planet that we experience as high and low tides. The gravitational pull of the moon on those bulges, plus the friction between the tides and the ocean floor, acts like a brake on our spinning planet.</p> <p>鈥淪unlight also produces an atmospheric tide with the same type of bulges,鈥 says Murray. 鈥淭he sun's gravity pulls on these atmospheric bulges, producing a torque on the Earth. But instead of slowing down Earth鈥檚 rotation like the moon, it speeds it up.鈥</p> <p>For most of Earth鈥檚 geological history, the lunar tides have overpowered the solar tides by about a factor of ten&nbsp;鈥 hence the Earth鈥檚 slowing rotational speed and lengthening days.</p> <p>But some two billion years ago, the atmospheric bulges were larger because the atmosphere was warmer and because its natural resonance&nbsp;鈥 the frequency at which waves move through it&nbsp;鈥 matched the length of day.</p> <p>The atmosphere, like a bell, resonates at a frequency determined by various factors, including temperature. In other words, waves&nbsp;鈥 like those generated by the enormous eruption of the volcano Krakatoa in Indonesia in 1883&nbsp;鈥 travel through it at a velocity determined by its temperature. The same principle explains why a bell always produces the same note if its temperature is constant.</p> <p>Throughout most of Earth鈥檚 history that atmospheric resonance has been out of sync with the planet鈥檚 rotational rate. Today, each of the two atmospheric 鈥渉igh tides鈥 take 22.8 hours to travel around the world. Since that resonance and Earth鈥檚 24-hour rotational period are out of sync, the atmospheric tide is relatively small.</p> <p>But during the billion-year period under study, the atmosphere was warmer and resonated with a period of about 10 hours. Also, at the advent of that epoch, Earth鈥檚 rotation&nbsp;鈥 slowed by the moon&nbsp;鈥 reached 20 hours.</p> <p>When the atmospheric resonance and length of day became even factors (ten and 20), the atmospheric tide was reinforced, the bulges became larger and the sun鈥檚 tidal pull became strong enough to counter the lunar tide.</p> <p>鈥淚t鈥檚 like pushing a child on a swing,鈥 Murray says.</p> <p>鈥淚f your push and the period of the swing are out of sync, it鈥檚 not going to go very high. But, if they鈥檙e in sync and you鈥檙e pushing just as the swing stops at one end of its travel, the push will add to the momentum of the swing and it will go further and higher. That鈥檚 what happened with the atmospheric resonance and tide.鈥</p> <p>Along with geological evidence, Murray and his colleagues achieved their result using global atmospheric circulation models (GCMs) to predict the atmosphere鈥檚 temperature during this period. The GCMs are the same models used by climatologists to study global warming. Murray says the fact they worked so well in the team鈥檚 research is a timely lesson.</p> <p>鈥淚've talked to people who are climate-change skeptics who don't believe in the global circulation models that are telling us we鈥檙e in a climate crisis,鈥 he says. 鈥淎nd I tell them: We used these global circulation models in our research, and they got it right. They work.鈥</p> <p>Despite its remoteness in geological history, the result adds additional perspective to the climate crisis. Because the atmospheric resonance changes with temperature, Murray points out that our current warming atmosphere could have consequences in this tidal imbalance.</p> <p>鈥淎s we increase Earth's temperature with global warming, we鈥檙e also making the resonant frequency move higher&nbsp;鈥 we鈥檙e moving our atmosphere farther away from resonance. As a result, there's less torque from the sun and therefore the length the day is going to get longer&nbsp;鈥 sooner than it would otherwise.鈥</p> </div> <div class="field field--name-field-news-home-page-banner field--type-boolean field--label-above"> <div class="field__label">News home page banner</div> <div class="field__item">Off</div> </div> Thu, 13 Jul 2023 16:54:12 +0000 siddiq22 302246 at 'A very big deal': Astrophysicist Ue-Li Pen on the first image of the Milky Way's supermassive black hole /news/very-big-deal-astrophysicist-ue-li-pen-first-image-milky-way-s-supermassive-black-hole <span class="field field--name-title field--type-string field--label-hidden">'A very big deal': Astrophysicist Ue-Li Pen on the first image of the Milky Way's supermassive black hole </span> <div class="field field--name-field-featured-picture field--type-image field--label-hidden field__item"> <img loading="eager" srcset="/sites/default/files/styles/news_banner_370/public/black-hole-2-weblead.jpg?h=afdc3185&amp;itok=ZoH02Fgl 370w, /sites/default/files/styles/news_banner_740/public/black-hole-2-weblead.jpg?h=afdc3185&amp;itok=JBmpZrMz 740w, /sites/default/files/styles/news_banner_1110/public/black-hole-2-weblead.jpg?h=afdc3185&amp;itok=uMiuRF3K 1110w" sizes="(min-width:1200px) 1110px, (max-width: 1199px) 80vw, (max-width: 767px) 90vw, (max-width: 575px) 95vw" width="740" height="494" src="/sites/default/files/styles/news_banner_370/public/black-hole-2-weblead.jpg?h=afdc3185&amp;itok=ZoH02Fgl" alt="&quot;&quot;"> </div> <span class="field field--name-uid field--type-entity-reference field--label-hidden"><span>Christopher.Sorensen</span></span> <span class="field field--name-created field--type-created field--label-hidden"><time datetime="2022-05-13T10:03:34-04:00" title="Friday, May 13, 2022 - 10:03" class="datetime">Fri, 05/13/2022 - 10:03</time> </span> <div class="clearfix text-formatted field field--name-field-cutline-long field--type-text-long field--label-above"> <div class="field__label">Cutline</div> <div class="field__item">The first image of Sagittarius A*, or Sgr A*, the supermassive black hole at the centre of our Milky Way galaxy (Image by Event Horizon Telescope Collaboration)</div> </div> <div class="field field--name-field-author-reporters field--type-entity-reference field--label-hidden field__items"> <div class="field__item"><a href="/news/authors-reporters/josslyn-johnstone" hreflang="en">Josslyn Johnstone</a></div> </div> <div class="field field--name-field-topic field--type-entity-reference field--label-above"> <div class="field__label">Topic</div> <div class="field__item"><a href="/news/topics/our-community" hreflang="en">Our Community</a></div> </div> <div class="field field--name-field-story-tags field--type-entity-reference field--label-hidden field__items"> <div class="field__item"><a href="/news/tags/canadian-institute-theoretical-astrophysics" hreflang="en">Canadian Institute for Theoretical Astrophysics</a></div> <div class="field__item"><a href="/news/tags/dunlap-institute-astronomy-astrophysics" hreflang="en">Dunlap Institute for Astronomy &amp; Astrophysics</a></div> <div class="field__item"><a href="/news/tags/faculty-arts-science" hreflang="en">Faculty of Arts &amp; Science</a></div> <div class="field__item"><a href="/news/tags/global" hreflang="en">Global</a></div> <div class="field__item"><a href="/news/tags/milky-way" hreflang="en">Milky Way</a></div> <div class="field__item"><a href="/news/tags/space" hreflang="en">Space</a></div> </div> <div class="clearfix text-formatted field field--name-body field--type-text-with-summary field--label-hidden field__item"><p>Astronomers this week revealed&nbsp;the first image of the supermassive black hole&nbsp;at the heart of a galaxy not so far, far away 鈥 our home galaxy, the Milky Way.</p> <p>Scientists had previously observed stars orbiting around something invisible, compact&nbsp;and very massive at the centre of the Milky Way. Known as Sagittarius A*, or Sgr A*, the object was strongly believed to be a black hole.</p> <p>The&nbsp;<a href="https://eventhorizontelescope.org/">Event Horizon Telescope (EHT) collaboration</a>&nbsp;is the international research team behind <a href="https://eventhorizontelescope.org/blog/astronomers-reveal-first-image-black-hole-heart-our-galaxy">this groundbreaking achievement</a>, involving over 300 scientists from 80 institutions around the globe. The EHT team linked together eight existing radio observatories across the planet to form a single Earth-sized virtual telescope to provide the first direct visual evidence of Sgr A*. The telescope is named after the event horizon, the boundary of the black hole beyond which no light can escape.</p> <p>It is just the second image of a black hole to be captured after&nbsp;<a href="/news/u-t-astrophysicist-ue-li-pen-first-ever-image-black-hole-and-international-collaboration-behind">EHT revealed the first-ever image of M87*&nbsp;in the distant Messier 87 galaxy in 2019</a>.&nbsp;</p> <p><a href="https://www.cita.utoronto.ca/">Canadian Institute for Theoretical Astrophysics</a>&nbsp;(CITA) Professor&nbsp;<strong>Ue-Li Pen</strong>&nbsp;is a collaborating scientist on the EHT project. Currently based in Taipei, Taiwan, Pen is also the director of the&nbsp;Academia Sinica Institute for Astronomy and Astrophysics, one of the key institutes leading the experiment, and an associate faculty member at the&nbsp;Dunlap Institute for Astronomy &amp; Astrophysics&nbsp;in the University of Toronto鈥檚 Faculty of Arts &amp; Science.</p> <p>He recently shared&nbsp;his insights with writer <strong>Josslyn Johnstone</strong> on the discovery, the results of which were <a href="https://iopscience.iop.org/journal/2041-8205/page/Focus_on_First_Sgr_A_Results">published May 12 in a special issue of&nbsp;<em>The Astrophysical Journal Letters</em></a>&nbsp;and showcased at&nbsp;simultaneous press conferences&nbsp;held around the world.</p> <hr> <p><strong>What makes this new, second image of a black hole so important?</strong></p> <p>Scientifically, this discovery is a very big deal because Sgr A* is more than a thousand times closer than M87* 鈥 about 27,000 light-years away versus 53 million. We can study it in much finer detail and can do so much more with it than with an object that鈥檚 very far away and barely measurable.</p> <p>This black hole being in our home galaxy 鈥 as close to home as you can get when talking about outer space, anyway 鈥 makes it that much more fascinating and immediate. I liken it to this: It鈥檚 one thing to discover an ancient dinosaur bone, and another entirely to see a live dinosaur right in your backyard.</p> <p>It is an astounding collective achievement&nbsp;where researchers collaborated across continents, countries, cultures and time zones to make it happen. It shows what amazing things can happen when people work together.</p> <p><strong>If this black hole is so much closer, why&nbsp;did researchers&nbsp;first capture an image of M87*?</strong>&nbsp;</p> <p>When seen from Earth, the angular size of both black holes is similar. However, M87* is not only much further away, but it is more than a thousand times bigger and more massive than Sgr A*. It's like the moon and the sun&nbsp;鈥 they appear roughly the same size from Earth, but the sun is much larger.</p> <p>It is hard to make an image instantly because we don't have all the information 鈥 the missing pixels, so to speak. Ideally, you would cover the whole Earth with telescopes but, of course, we don't have that many.&nbsp;We had eight telescopes capturing data at any given time. So, to fill in the gaps on the planet where there are no telescopes, where there is no data, we wait for the Earth to rotate.</p> <p>Because the black hole that is farther away is much bigger, it rotates more slowly. That makes is easier to scan across the black hole and make one image. The black hole in the centre of our own galaxy is much smaller and varying intrinsically 鈥 meaning, instead of scanning a static snapshot of an object, you are trying to reconstruct something that is constantly changing as you look at it. It's tricky to disentangle what is due to the earth rotating or the black hole rotating, because they are both changing. That's why it took so many years longer to image Sgr A*, even though the data for both black holes was collected in the same 2017 period.</p> <p><strong>Is this why there is such a visual difference between the Sgr A* and M87* images?</strong></p> <p>Right 鈥 unlike the 2019 M87* image, which was one clear picture of a black hole, in this case it is a series of images that are reconstructions of what Sgr A* might look like. It is not as distinct, where you can say, 鈥淭his is it.鈥 Instead, it is a Platonic master image with variations of what it could look like: 鈥淚t may look like this, or it may look like that.鈥</p> <p>It鈥檚 like taking a picture of a fast-moving object, like a baseball, on an SLR camera 鈥 the ball is moving at the same time as the exposure, so you end up with a distorted image.</p> <p><strong>What questions are we hoping to answer with this new image?</strong></p> <p>In a sense, by capturing that first image of the black hole that was farther away, we still had the same questions 鈥 then had even more. I think the image of Sgr A* holds all the answers, or at least a lot of them, because we鈥檙e able to get that much closer to see what鈥檚 going on. We already knew the black hole was there. Now we have a hope of understanding why black holes exist and how they form&nbsp;by studying the surrounding environment. My primary research interests are the compact objects near the black hole called pulsars, so I am looking to measure pulsars in the same dataset.</p> <p><strong>Now that we have the image, what are the researchers working on next?</strong></p> <p>The next analysis will be incredibly scientifically valuable, as it will measure the polarization of the emission. Think of polarized sunglasses, where light comes in two polarizations that you can study: reflected sunlight and the resulting glare. By rotating your polarization filter, you can understand what is reflected and what is not. This is similar for the black hole. With polarization, you can study the nature of the radiation emission. Whereas right now, it's a bit unclear what we're looking at. With polarization I think it will be much clearer.</p> </div> <div class="field field--name-field-news-home-page-banner field--type-boolean field--label-above"> <div class="field__label">News home page banner</div> <div class="field__item">Off</div> </div> Fri, 13 May 2022 14:03:34 +0000 Christopher.Sorensen 174708 at Astronomers focus robotic eyes on the Milky Way, our cosmic home /news/astronomers-focus-robotic-eyes-milky-way-our-cosmic-home <span class="field field--name-title field--type-string field--label-hidden">Astronomers focus robotic eyes on the Milky Way, our cosmic home</span> <div class="field field--name-field-featured-picture field--type-image field--label-hidden field__item"> <img loading="eager" srcset="/sites/default/files/styles/news_banner_370/public/SDSS-telescope-lead-crop.jpg?h=afdc3185&amp;itok=TaLj025D 370w, /sites/default/files/styles/news_banner_740/public/SDSS-telescope-lead-crop.jpg?h=afdc3185&amp;itok=6RUWGhnT 740w, /sites/default/files/styles/news_banner_1110/public/SDSS-telescope-lead-crop.jpg?h=afdc3185&amp;itok=zTA-tlri 1110w" sizes="(min-width:1200px) 1110px, (max-width: 1199px) 80vw, (max-width: 767px) 90vw, (max-width: 575px) 95vw" width="740" height="494" src="/sites/default/files/styles/news_banner_370/public/SDSS-telescope-lead-crop.jpg?h=afdc3185&amp;itok=TaLj025D" alt="&quot;&quot;"> </div> <span class="field field--name-uid field--type-entity-reference field--label-hidden"><span>Christopher.Sorensen</span></span> <span class="field field--name-created field--type-created field--label-hidden"><time datetime="2022-01-20T19:22:28-05:00" title="Thursday, January 20, 2022 - 19:22" class="datetime">Thu, 01/20/2022 - 19:22</time> </span> <div class="clearfix text-formatted field field--name-field-cutline-long field--type-text-long field--label-above"> <div class="field__label">Cutline</div> <div class="field__item">The Sloan Foundation 2.5-metre telescope at Apache Point Observatory in New Mexico is one of two sites to use a new Focal Plane System to study the Milky Way (photo courtesy of Fermilab Visual Media Services)</div> </div> <div class="field field--name-field-author-reporters field--type-entity-reference field--label-hidden field__items"> <div class="field__item"><a href="/news/authors-reporters/chris-sasaki" hreflang="en">Chris Sasaki</a></div> <div class="field__item"><a href="/news/authors-reporters/sean-bettam" hreflang="en">Sean Bettam</a></div> </div> <div class="field field--name-field-topic field--type-entity-reference field--label-above"> <div class="field__label">Topic</div> <div class="field__item"><a href="/news/topics/global-lens" hreflang="en">Global Lens</a></div> </div> <div class="field field--name-field-story-tags field--type-entity-reference field--label-hidden field__items"> <div class="field__item"><a href="/news/tags/astronomy-astrophysics" hreflang="en">Astronomy &amp; Astrophysics</a></div> <div class="field__item"><a href="/news/tags/canadian-institute-theoretical-astrophysics" hreflang="en">Canadian Institute for Theoretical Astrophysics</a></div> <div class="field__item"><a href="/news/tags/dunlap-institute-astronomy-astrophysics" hreflang="en">Dunlap Institute for Astronomy &amp; Astrophysics</a></div> <div class="field__item"><a href="/news/tags/faculty-arts-science" hreflang="en">Faculty of Arts &amp; Science</a></div> <div class="field__item"><a href="/news/tags/milky-way" hreflang="en">Milky Way</a></div> <div class="field__item"><a href="/news/tags/space" hreflang="en">Space</a></div> </div> <div class="clearfix text-formatted field field--name-body field--type-text-with-summary field--label-hidden field__item"><p>Thanks to a breakthrough robotic innovation, an international collaboration that includes the University of Toronto has advanced the Sloan Digital Sky Survey (SDSS), a 20-year-long research project that has been investigating the structure and evolution of our cosmic home, the Milky Way galaxy.</p> <p>A new Focal Plane System (FPS) is at the heart of the fifth phase of the project, dubbed SDSS-V. The system&nbsp;replaces a time-consuming, hands-on approach to making simultaneous observations of hundreds of stars that required astronomers to manually plug hundreds of optical fibres into holes drilled into a metal plate in the focal plane of a telescope.</p> <p>With this new innovation, the system鈥檚&nbsp;500 robotic positioner units replace human hands and precisely maneuver optical fibres into position in the telescope鈥檚 focal plane so that each can gather the light of a specific star within the target area.</p> <p>鈥淲e are going from collecting a few thousand spectra per night to nearly 15 thousand,鈥 says <strong>Juna Kollmeier</strong>, director of SDSS-V, the fifth phase of SDSS, and <a href="/news/renowned-scholar-juna-kollmeier-named-director-u-t-s-canadian-institute-theoretical">director of 茄子直播鈥檚&nbsp;Canadian Institute for Theoretical Astrophysics&nbsp;(CITA)</a>.</p> <p>鈥淚t's a fantastic change in how we operate that will not only allow us to survey more objects, but to probe these systems over time, on timescales we couldn't access previously. This opens up a tremendous wealth of new science.鈥</p> <p>In addition to Kollmeier, other 茄子直播 astronomers involved in SDSS-V include&nbsp;Associate Professor&nbsp;<strong>Jo Bovy</strong>,&nbsp;Assistant Professor&nbsp;<strong>Maria Drout</strong>&nbsp;and<strong>&nbsp;</strong>Assistant Professor <strong>Ting Li&nbsp;</strong>鈥 all&nbsp;of the David A. Dunlap department of astronomy and astrophysics in the Faculty of Arts &amp; Science&nbsp;鈥 and&nbsp;<strong>Ted Mackereth</strong>, a<strong>&nbsp;</strong>Banting-Dunlap-CITA post-doctoral fellow.</p> <p>鈥淚 run massive calculations about the Milky Way galaxy,鈥 says Mackereth. 鈥淎t the end of the day, I want to test these ideas and SDSS-V will be a key way to do that.鈥&nbsp;<br> &nbsp;<br> 鈥淪DSS has been an important testbed for some of the most exciting advances in machine learning,鈥 adds Bovy, whose early work in previous phases of SDSS pioneered techniques for age-dating in the galaxy. 鈥淯sing these techniques, we are able to get ages for millions of stars 鈥 something we didn't think was possible when SDSS began."&nbsp;<br> &nbsp;<br> Drout, meanwhile,&nbsp;is one of the leaders of the Time Domain effort in SDSS-V. She and her collaborators will use the spectra statistically to probe the ways in which&nbsp;astrophysical objects change in time.</p> <p><img alt src="/sites/default/files/SDSS-V-FPS-crop.jpg" style="width: 750px; height: 500px;"></p> <p><em>The Focal Plane System&nbsp;replaces a time-consuming, hands-on approach to making simultaneous observations of hundreds of stars (photo courtesy of&nbsp;SDSS-V)</em></p> <p>The development of the new robotic FPS was a five-year effort <a href="https://www.sdss5.org/collaboration/affiliate-institutions/">by an&nbsp;international team</a>, including Ohio State University鈥檚 Imaging Sciences Laboratory, the University of Washington, 脡cole Polytechnique F茅d茅rale de Lausanne (EPFL)&nbsp;and the Carnegie Observatories in Pasadena.</p> <p>The design teams overcame numerous challenges posed by the global pandemic by developing and constructing components wherever they were 鈥 some in their own garages and backyards 鈥 and shipping them elsewhere for further assembly. The robots were built in Switzerland and integrated into the main mechanical units in Columbus, Ohio.</p> <p>Previous phases of SDSS observed nearly a million stars in our home galaxy using spectrographs 鈥 instruments capable of measuring a star鈥檚 light at different wavelengths. The resulting spectra reveal a remarkable amount of information about stars: their age, temperature, chemical composition, motion and more. SDSS-V will observe over five million stars.</p> <p>There are two FPS units. One is in operation on the Sloan Foundation 2.5-metre&nbsp;telescope at Apache Point Observatory (APO) in New Mexico. A second unit is under construction and when complete, will operate on a telescope at the Las Campanas Observatory in northern Chile. (At the Las Campanas Observatory in 1987, 茄子直播 astronomer <strong>Ian Shelton</strong> was one of the two observers to first see Supernova 1987A, an exploding star in the Milky Way galaxy鈥檚 companion galaxy, the Large Magellanic Cloud.)</p> <p>The FPS will enable two of the three core science programs in SDSS-V: the Milky Way Mapper (MWM) and the Black Hole Mapper (BHM). Together, these projects will collect data from millions of objects spread across the sky, from stars in our own galactic backyard to unimaginably distant supermassive black holes.</p> <p>The MWM will study our home galaxy in unprecedented detail. It will take advantage of our unique perspective within the Milky Way to create a high-resolution map of the galaxy鈥檚 stars and how they are moving.</p> <p>The MWM will also measure masses, ages, chemical compositions, the presence of companions&nbsp;and a slew of other properties for vast samples of stars of all types 鈥 including hot massive stars, stars that are just forming&nbsp;and the white dwarfs that are dead remnants of stars like our Sun. It will also target tens of thousands of multi-star and planetary systems in order to understand how often multi-companion systems form and what determines how they are structured.</p> <p>Looking farther afield, the BHM will study quasars, which are among the most luminous objects in the universe. Powered by material flowing into supermassive black holes at the centres of galaxies, quasars can be used as beacons to trace the growth of these titans over cosmic time. SDSS-V will collect data on more than 300,000 quasars to measure the masses of their black holes, understand the physics of how they gobble up matter&nbsp;and trace their growth over many billions of years.</p> <p>These vast samples of strikingly different types of targets 鈥 millions of Milky Way Galaxy stars, hundreds of thousands of distant quasars 鈥 are among the key aspects that set SDSS-V apart from other surveys and are enabled by the new FPS system.</p> <p>鈥淭his project has been truly collaborative, involving the contributions of scientists at more than&nbsp;50 institutions&nbsp;from around the world,鈥 says Kollmeier.</p> <p>鈥淲e are thrilled to have reached this technological milestone despite being in the midst of a global pandemic and are excited to witness how this shift will enhance the work of the project.鈥</p> <p><em>With files from SDSS</em></p> </div> <div class="field field--name-field-news-home-page-banner field--type-boolean field--label-above"> <div class="field__label">News home page banner</div> <div class="field__item">Off</div> </div> Fri, 21 Jan 2022 00:22:28 +0000 Christopher.Sorensen 172213 at Renowned scholar Juna Kollmeier named director of 茄子直播鈥檚 Canadian Institute for Theoretical Astrophysics /news/renowned-scholar-juna-kollmeier-named-director-u-t-s-canadian-institute-theoretical <span class="field field--name-title field--type-string field--label-hidden">Renowned scholar Juna Kollmeier named director of 茄子直播鈥檚 Canadian Institute for Theoretical Astrophysics</span> <div class="field field--name-field-featured-picture field--type-image field--label-hidden field__item"> <img loading="eager" srcset="/sites/default/files/styles/news_banner_370/public/TED2019_1_Photo%20credit-Bret%20Hartman-TED.jpg?h=afdc3185&amp;itok=GPceJ5qQ 370w, /sites/default/files/styles/news_banner_740/public/TED2019_1_Photo%20credit-Bret%20Hartman-TED.jpg?h=afdc3185&amp;itok=OQjMRmxn 740w, /sites/default/files/styles/news_banner_1110/public/TED2019_1_Photo%20credit-Bret%20Hartman-TED.jpg?h=afdc3185&amp;itok=eG26Nu2l 1110w" sizes="(min-width:1200px) 1110px, (max-width: 1199px) 80vw, (max-width: 767px) 90vw, (max-width: 575px) 95vw" width="740" height="494" src="/sites/default/files/styles/news_banner_370/public/TED2019_1_Photo%20credit-Bret%20Hartman-TED.jpg?h=afdc3185&amp;itok=GPceJ5qQ" alt="&quot;&quot;"> </div> <span class="field field--name-uid field--type-entity-reference field--label-hidden"><span>Christopher.Sorensen</span></span> <span class="field field--name-created field--type-created field--label-hidden"><time datetime="2021-03-31T10:25:48-04:00" title="Wednesday, March 31, 2021 - 10:25" class="datetime">Wed, 03/31/2021 - 10:25</time> </span> <div class="clearfix text-formatted field field--name-field-cutline-long field--type-text-long field--label-above"> <div class="field__label">Cutline</div> <div class="field__item">Juna Kollmeier, who will become the new director of CITA on July 1, is an observationally oriented astrophysicist whose research focuses on supermassive black holes, the Milky Way and the intergalactic medium (photo by Bret Harman/TED)</div> </div> <div class="field field--name-field-author-reporters field--type-entity-reference field--label-hidden field__items"> <div class="field__item"><a href="/news/authors-reporters/lucianna-ciccocioppo" hreflang="en">Lucianna Ciccocioppo</a></div> </div> <div class="field field--name-field-topic field--type-entity-reference field--label-above"> <div class="field__label">Topic</div> <div class="field__item"><a href="/news/topics/global-lens" hreflang="en">Global Lens</a></div> </div> <div class="field field--name-field-story-tags field--type-entity-reference field--label-hidden field__items"> <div class="field__item"><a href="/news/tags/alumni" hreflang="en">茄子直播</a></div> <div class="field__item"><a href="/news/tags/astronomy-astrophysics" hreflang="en">Astronomy &amp; Astrophysics</a></div> <div class="field__item"><a href="/news/tags/canadian-institute-theoretical-astrophysics" hreflang="en">Canadian Institute for Theoretical Astrophysics</a></div> <div class="field__item"><a href="/news/tags/faculty-arts-science" hreflang="en">Faculty of Arts &amp; Science</a></div> <div class="field__item"><a href="/news/tags/ted-sargent" hreflang="en">Ted Sargent</a></div> <div class="field__item"><a href="/news/tags/united-states" hreflang="en">United States</a></div> </div> <div class="clearfix text-formatted field field--name-body field--type-text-with-summary field--label-hidden field__item"><p class="Heading" style="border:none; margin-top:16px">Renowned astrophysicist <b>Juna Kollmeier</b>, <a href="https://carnegiescience.edu/scientist/juna-kollmeier">on faculty at the Observatories of the Carnegie Institution for Science</a>, has been named the new director of the University of Toronto鈥檚 <a href="https://www.cita.utoronto.ca/">Canadian Institute for Theoretical Astrophysics</a> (CITA), a research centre focused on the origin and evolution of the universe and other phenomena discovered by modern astronomy.</p> <p class="Body" style="border:none; margin-bottom:11px">An observationally oriented theorist 鈥 uncommon in astrophysics 鈥 Kollmeier is the founding director of the Carnegie Theoretical Astrophysics Center and director of the <a href="https://www.sdss.org/future/">Sloan Digital Sky Surveys</a> (SDSS-V). A scientist committed to public outreach and the 鈥渋nalienable right to physics鈥 for everyone, she studies how structures grow and evolve in the universe, and focuses on supermassive black holes, the Milky Way and the intergalactic medium. Her 2019 <a href="http://ted.com/talks/juna_kollmeier_the_most_detailed_map_of_galaxies_black_holes_and_stars_ever_made">TED Talk</a> has attracted more than 2.6 million views and, among other documentaries, she was in an episode of the series <a href="https://search.alexanderstreet.com/preview/work/bibliographic_entity%7Cvideo_work%7C3572815"><i>Genius</i> by Stephen Hawking</a>.</p> <p class="Body" style="border:none; margin-bottom:11px">鈥淚 am thrilled to welcome Juna Kollmeier to the University of Toronto to take on this important leadership role,鈥 says <b>Melanie Woodin</b>, dean of the Faculty of Arts &amp; Science, which is home to CITA. 鈥淭his appointment is truly an outstanding 鈥榖rain gain鈥 for Canada. An impressive scholar, passionate scientist and mentor, she is also brilliant at engaging the public in understanding our universe. She will undoubtedly advance CITA鈥檚 remarkable research and novel discoveries in astrophysics and cosmology to new frontiers.鈥</p> <p class="Body" style="border:none; margin-bottom:11px">Kollmeier鈥檚 appointment is the result of a comprehensive, global recruitment process and underscores the university鈥檚 commitment <a href="https://www.artsci.utoronto.ca/news/gender-equity-and-leadership-as-dean-woodin-featured-women-make-more-half-u-ts-deans">to diversifying leadership</a> across disciplines. When she begins on July 1, 2021, Kollmeier will be the first woman to lead CITA.</p> <p class="Body" style="border:none; margin-bottom:11px">鈥淐ITA is Canada鈥檚 hub for research and discovery in theoretical astrophysics,鈥 says Kollmeier. 鈥淚t's been a tremendous global force, has contributed to cosmology, to our understanding of black hole growth and evolution, to star formation and to high energy astrophysics. I think 茄子直播 shines brightly as a place where excellence thrives and grows. This is an incredible opportunity to lead an incredible organization.鈥</p> <p class="Body" style="border:none; margin-bottom:11px">Kollmeier holds a bachelor of science in physics with honours from the California Institute of Technology, and a master of science and PhD in astronomy 鈥 both from The Ohio State University, where, in addition to her thesis work, she designed, built and deployed instrumentation parts for two telescopes as part of the Ohio State Astronomy Instrumentation Lab team. She was an Institute for Advanced Study Visiting Professor in 2015-16 and a Fulbright Scholar, and received Hubble and Carnegie-Princeton Fellowships. She is a <a href="https://cifar.ca/">CIFAR Fellow</a> and, most recently, has been selected the 2022 International Solvay Chair in Physics.</p> <p class="Body" style="border:none; margin-bottom:11px">鈥淪he is an exceptional scientist, mentor and collaborator,鈥 says <b>Norman Murray</b>, current director of CITA. 鈥淚'm excited that she will help advance our mission to expand Canada鈥檚 capacity in theoretical astrophysics and grow our national and international networks, as our post-doctoral fellows go on to teach and innovate at many other leading universities.鈥</p> <p class="Body" style="border:none; margin-bottom:11px">Kollmeier replaces Murray, who is completing his third term as director. She says she is looking forward to joining an extraordinary community of scholars at 茄子直播 this summer.</p> <p class="Body" style="border:none; margin-bottom:11px">鈥淲e are arriving at an incredibly exciting point in the overall history of astrophysics, where we have these rich datasets. And they allow us to explore a variety of deep questions, all open questions that are on the verge of breaking apart,鈥 she says. 鈥淛oining this community will take my own research to the next level, and that's tremendously exciting.鈥</p> <p class="Body" style="border:none; margin-bottom:11px"><b>Ted Sargent</b>, 茄子直播鈥檚 vice-president, research and innovation, and strategic initiatives, says Kollmeier is a globally celebrated scholar.</p> <p class="Body" style="border:none; margin-bottom:11px">鈥淗er appointment exemplifies the outstanding calibre of researcher 茄子直播 continues to attract,鈥 Sargent says. 鈥淯nder Professor Kollmeier鈥檚 leadership, CITA will continue to achieve transformative discoveries, build national and global networks, and will continue to advance as one of the world鈥檚 leading theoretical astrophysics research hubs.鈥</p> <p class="Body" style="border:none; margin-bottom:11px">茄子直播 alumna <b>Wendy Freedman</b>, an astrophysicist at the University of Chicago, hired Kollmeier as the first theorist at the <a href="https://obs.carnegiescience.edu/">Observatories of the Carnegie Institution for Science,</a> when Freedman was its director.</p> <p>鈥淛una is remarkably bright and enthusiastic about whatever she does, and it's hard not to get caught up in her infectious enthusiasm for whatever problem she鈥檚 working on,鈥 says Freedman. 鈥淪he's unusual in that she has a real interest in observations, not just the theory. And she chooses projects that interface very well with what observers are doing, and what you can learn from the observations. It's a great niche area where she can bring together groups of theorists and observers to initiate new projects that can benefit from that kind of analysis. I was delighted when I heard the news. It struck me as a really good match.鈥</p> <p>鈥淛una is very knowledgeable and knows lots of people,鈥 says colleague Matias Zaldarriaga, a cosmologist at the Institute for Advanced Study. 鈥淎nd I think that's a very good combination for someone leading CITA, to recruit and attract people with a wider range of research topics, and to create an atmosphere where people can collaborate and learn new things. She will bring this breadth of interest and expertise that I think will be very noticeable and very attractive to a lot of people.鈥</p> <p style="margin-bottom:15px">Hans-Walter Rix, director at the Max Planck Institute for Astronomy in Heidelberg, Germany, has known Kollmeier since her time at graduate school. 鈥淓ven back then it was very obvious she just was in a different category than most grad students,鈥 says Rix. 鈥淭his is a fantastic appointment for CITA because I think it is a role that fits her ambitious capabilities. She brings a vision and an energy that will be a tremendous boost for the place.鈥</p> <p style="margin-bottom:15px">As the first woman to lead CITA, Kollmeier will have a formidable impact, says McGill University鈥檚 Victoria Kaspi, physics professor and director of the McGill Space Institute.</p> <p>鈥淚 think she'll be a tremendous role model and a mentor to the next generation of women in astrophysics and in STEM in general,鈥 says Kaspi. 鈥淚n addition, she also is an incredibly creative, versatile person, and she has tremendous energy and drive. I think she is going to shake the place up and bring CITA to new heights.鈥</p> <p class="Body" style="border:none; margin-bottom:15px">Meg Urry, director of the Yale Center for Astronomy and Astrophysics, and a former president of the American Astronomical Society, says she has seen 鈥淛una鈥檚 impressive leadership up close.鈥 Urry serves on the executive committee of the advisory council of the SDSS-V project. 鈥淭hat she is a distinguished theorist selected to lead this important institute 鈥 well, it shows Juna is a star on all fronts.鈥</p> </div> <div class="field field--name-field-news-home-page-banner field--type-boolean field--label-above"> <div class="field__label">News home page banner</div> <div class="field__item">Off</div> </div> Wed, 31 Mar 2021 14:25:48 +0000 Christopher.Sorensen 168952 at Astronomers at 茄子直播, other universities propose measures to reduce their carbon footprint /news/astronomers-u-t-other-universities-propose-measures-reduce-their-carbon-footprint <span class="field field--name-title field--type-string field--label-hidden">Astronomers at 茄子直播, other universities propose measures to reduce their carbon footprint</span> <div class="field field--name-field-featured-picture field--type-image field--label-hidden field__item"> <img loading="eager" srcset="/sites/default/files/styles/news_banner_370/public/GettyImages-997727746.jpg?h=afdc3185&amp;itok=btWddFi0 370w, /sites/default/files/styles/news_banner_740/public/GettyImages-997727746.jpg?h=afdc3185&amp;itok=HD4ECwTq 740w, /sites/default/files/styles/news_banner_1110/public/GettyImages-997727746.jpg?h=afdc3185&amp;itok=UmbiYn1p 1110w" sizes="(min-width:1200px) 1110px, (max-width: 1199px) 80vw, (max-width: 767px) 90vw, (max-width: 575px) 95vw" width="740" height="494" src="/sites/default/files/styles/news_banner_370/public/GettyImages-997727746.jpg?h=afdc3185&amp;itok=btWddFi0" alt="&quot;&quot;"> </div> <span class="field field--name-uid field--type-entity-reference field--label-hidden"><span>Christopher.Sorensen</span></span> <span class="field field--name-created field--type-created field--label-hidden"><time datetime="2020-06-24T09:42:20-04:00" title="Wednesday, June 24, 2020 - 09:42" class="datetime">Wed, 06/24/2020 - 09:42</time> </span> <div class="clearfix text-formatted field field--name-field-cutline-long field--type-text-long field--label-above"> <div class="field__label">Cutline</div> <div class="field__item"> 茄子直播's Chris Matzner is the lead author of a white paper that proposes, among other things, prioritizing international travel for early-career astronomers and adopting carbon offsets (photo by Mujahid Safodien/AFP via Getty Images)</div> </div> <div class="field field--name-field-author-reporters field--type-entity-reference field--label-hidden field__items"> <div class="field__item"><a href="/news/authors-reporters/chris-sasaki" hreflang="en">Chris Sasaki</a></div> </div> <div class="field field--name-field-topic field--type-entity-reference field--label-above"> <div class="field__label">Topic</div> <div class="field__item"><a href="/news/topics/our-community" hreflang="en">Our Community</a></div> </div> <div class="field field--name-field-story-tags field--type-entity-reference field--label-hidden field__items"> <div class="field__item"><a href="/news/tags/canadian-institute-theoretical-astrophysics" hreflang="en">Canadian Institute for Theoretical Astrophysics</a></div> <div class="field__item"><a href="/news/tags/climate-change" hreflang="en">Climate Change</a></div> <div class="field__item"><a href="/news/tags/dunlap-institute-astronomy-astrophysics" hreflang="en">Dunlap Institute for Astronomy &amp; Astrophysics</a></div> <div class="field__item"><a href="/news/tags/faculty-arts-science" hreflang="en">Faculty of Arts &amp; Science</a></div> <div class="field__item"><a href="/news/tags/global" hreflang="en">Global</a></div> <div class="field__item"><a href="/news/tags/sustainability" hreflang="en">Sustainability</a></div> </div> <div class="clearfix text-formatted field field--name-body field--type-text-with-summary field--label-hidden field__item"><p>In 1960, long before his acclaimed book and television series&nbsp;<em>Cosmos</em>, the astronomer Carl Sagan determined that the inferno-like temperatures on Venus were the result of an atmosphere composed almost entirely of carbon dioxide. The gas had turned Venus into a greenhouse,&nbsp;trapping the sun鈥檚 energy and raising the planet鈥檚 surface temperature to above the melting point of lead.</p> <p>Carbon dioxide is also having a significant effect on our planet. Since the industrial revolution, the level of carbon dioxide in our atmosphere has risen drastically and is driving a greenhouse effect.</p> <p>鈥淟ike Sagan, astronomers today study planetary atmospheres and think about whether planets have the right conditions for life,鈥 says&nbsp;<strong>Chris Matzner</strong>, a professor in the Faculty of Arts &amp; Science鈥檚&nbsp;David A. Dunlap department of astronomy and astrophysics. 鈥淲e understand the physics of global warming and our current climate crisis.鈥</p> <p>It should come as no surprise, then, that Matzner 鈥 along with astronomers from 茄子直播鈥檚 Faculty of Arts &amp; Science and other Canadian institutions 鈥 has&nbsp;recently published a white paper that examines the carbon footprint of astronomical research and recommends ways of reducing it.</p> <p>鈥淐limate change has become an unparalleled crisis,鈥 says Matzner, lead author of the paper. 鈥淚t poses serious consequences for life on our planet. Our oceans are acidifying, extreme weather events are becoming more frequent, food and water insecurity is increasingly threatening the most vulnerable. The only responsible thing to do is to enact, in one鈥檚 professional life, the changes that we as a society have committed to.鈥</p> <p>The paper, titled 鈥<a href="https://arxiv.org/abs/1910.01272">Astronomy in a Low-Carbon Future</a>,鈥 was written for inclusion in the Canadian astronomical community鈥檚 long-range plan that identifies its priorities for the next 10 years. 茄子直播 authors include astronomers from the David A. Dunlap department of astronomy and astrophysics, the&nbsp;Dunlap Institute for Astronomy &amp; Astrophysics&nbsp;and the&nbsp;Canadian Institute for Theoretical Astrophysics&nbsp;(CITA). Other authors are from McGill University, Universit茅 de Montreal, St. Mary鈥檚 University, the National Research Council鈥檚 Herzberg Astronomy and Astrophysics Research Centre and the Universities of Alberta, New Brunswick and Waterloo.</p> <p>Among many issues discussed in the white paper is the impact of air travel, which is&nbsp;a major contributor to the global climate crisis. Astronomers fly frequently&nbsp;to observatories around the globe, including remote locations like Antarctica. They also fly to give talks and work with collaborators and to attend conferences, workshops and meetings.</p> <p>What鈥檚 more, professional expectations for hiring, tenure, and promotions often reward extensive international travel.</p> <p>Matzner and his co-authors propose multiple strategies to reduce astronomy鈥檚 travel-generated carbon footprint. They recommend replacing non-essential air travel with remote participation, ground travel or extended stays that encompass multiple events. They recommend prioritizing air travel for early-career astronomers over scientists with established careers because networking and in-person collaboration can be critical for young researchers. And when air travel is unavoidable, the resulting carbon produced should be offset 100 per cent. For example, Matzner and his Dunlap Institute colleagues have instituted a carbon offset pilot program in their own departments.</p> <p>They argue that when hiring and promoting, institutions should put less emphasis on the overall number of presentations an individual may have given at international institutions 鈥 a practice that entails an abundance of travel 鈥 and more value on a smaller number of high-impact presentations, as well as written research contributions. Similarly, the authors urge agencies and governments to treat climate-mitigation costs as legitimate research expenses, allowing grants to cover the potentially higher costs of ground transportation or carbon offsets.</p> <p>The authors also examine how the infrastructure of astronomical research comes with an environmental price tag, writing that 鈥渢elescopes, buildings and computing facilities must also be counted toward our climate impact.鈥</p> <p>For example, when it is completed, the&nbsp;Square Kilometre Array&nbsp;(SKA) will be the largest radio telescope array ever built, comprising thousands of radio antennas and dishes in South Africa and Australia. The authors point out that the supercomputer built to collect and process the enormous amounts of data generated will require as much electricity as 1,080 average homes.</p> <p>Matzner and his co-authors also recognize the role that astronomers as scientists, educators and communicators have to play in informing the public about the climate crisis. Not only do they understand the physics, they have the opportunity to reach the public through outreach events, the media and even introductory astronomy courses which, the authors point out, are often the only science course that many undergraduate students take.</p> <p>It鈥檚 a role not unlike the one&nbsp;Sagan played throughout his life by educating the public about our unique place in the cosmos and the fragility of the planet.</p> <p>鈥淥ur lovely blue planet, the Earth, is the only home we know,鈥 Sagan wrote in&nbsp;<em>Cosmos</em>. 鈥淰enus is too hot. Mars is too cold. But the Earth is just right, a heaven for humans.鈥</p> </div> <div class="field field--name-field-news-home-page-banner field--type-boolean field--label-above"> <div class="field__label">News home page banner</div> <div class="field__item">Off</div> </div> Wed, 24 Jun 2020 13:42:20 +0000 Christopher.Sorensen 165116 at 茄子直播 department of astronomy and astrophysics celebrates new name in honour of long-time supporters, the Dunlap family /news/u-t-department-astronomy-and-astrophysics-celebrates-new-name-honour-long-time-supporters <span class="field field--name-title field--type-string field--label-hidden">茄子直播 department of astronomy and astrophysics celebrates new name in honour of long-time supporters, the Dunlap family</span> <div class="field field--name-field-featured-picture field--type-image field--label-hidden field__item"> <img loading="eager" srcset="/sites/default/files/styles/news_banner_370/public/shutterstock686389909.jpg?h=afdc3185&amp;itok=JDT2h_rd 370w, /sites/default/files/styles/news_banner_740/public/shutterstock686389909.jpg?h=afdc3185&amp;itok=Jq6wui-y 740w, /sites/default/files/styles/news_banner_1110/public/shutterstock686389909.jpg?h=afdc3185&amp;itok=L13Aj37l 1110w" sizes="(min-width:1200px) 1110px, (max-width: 1199px) 80vw, (max-width: 767px) 90vw, (max-width: 575px) 95vw" width="740" height="494" src="/sites/default/files/styles/news_banner_370/public/shutterstock686389909.jpg?h=afdc3185&amp;itok=JDT2h_rd" alt="illustration of the milky way and a crescent moon "> </div> <span class="field field--name-uid field--type-entity-reference field--label-hidden"><span>Christopher.Sorensen</span></span> <span class="field field--name-created field--type-created field--label-hidden"><time datetime="2019-12-20T10:40:01-05:00" title="Friday, December 20, 2019 - 10:40" class="datetime">Fri, 12/20/2019 - 10:40</time> </span> <div class="clearfix text-formatted field field--name-field-cutline-long field--type-text-long field--label-above"> <div class="field__label">Cutline</div> <div class="field__item">(photo by Shutterstock)</div> </div> <div class="field field--name-field-author-reporters field--type-entity-reference field--label-hidden field__items"> <div class="field__item"><a href="/news/authors-reporters/sarah-macfarlane" hreflang="en">Sarah MacFarlane</a></div> </div> <div class="field field--name-field-topic field--type-entity-reference field--label-above"> <div class="field__label">Topic</div> <div class="field__item"><a href="/news/topics/our-community" hreflang="en">Our Community</a></div> </div> <div class="field field--name-field-story-tags field--type-entity-reference field--label-hidden field__items"> <div class="field__item"><a href="/news/tags/alumni" hreflang="en">茄子直播</a></div> <div class="field__item"><a href="/news/tags/astronomy-astrophysics" hreflang="en">Astronomy &amp; Astrophysics</a></div> <div class="field__item"><a href="/news/tags/canadian-institute-theoretical-astrophysics" hreflang="en">Canadian Institute for Theoretical Astrophysics</a></div> <div class="field__item"><a href="/news/tags/dunlap-institute-astronomy-astrophysics" hreflang="en">Dunlap Institute for Astronomy &amp; Astrophysics</a></div> <div class="field__item"><a href="/news/tags/faculty-arts-science" hreflang="en">Faculty of Arts &amp; Science</a></div> <div class="field__item"><a href="/news/tags/meric-gertler" hreflang="en">Meric Gertler</a></div> </div> <div class="clearfix text-formatted field field--name-body field--type-text-with-summary field--label-hidden field__item"><p>It is a&nbsp;historic time for the University of Toronto鈥檚 department of astronomy and astrophysics 鈥 not only as it approaches its centenary next year, but also as it embraces a new name: the&nbsp;<a href="https://www.astro.utoronto.ca/" rel="noopener noreferrer" target="_blank">David A. Dunlap Department of Astronomy &amp; Astrophysics</a>. The new name was announced officially Dec. 19 at a reception to honour the Dunlap family, hosted by 茄子直播 President <strong>Meric Gertler</strong> and Professor <strong>Melanie Woodin</strong>, dean of the Faculty of Arts &amp; Science.</p> <p>鈥淭his very fitting development recognizes the historic benefaction made in memory of <strong>David A. Dunlap</strong>, as well as the tremendous support provided to astronomy and astrophysics at U&nbsp;of&nbsp;T by his grandsons,<strong> Dr. David Dunlap</strong> and <strong>Dr. Moffat Dunlap</strong>,鈥 says President Gertler. 鈥淚t celebrates the crucial contribution of the Dunlap family to Canada鈥檚 global leadership in expanding our knowledge of the universe.鈥</p> <p>The Dunlap family鈥檚 support of 茄子直播&nbsp;spans nearly a century, dating back to 1921 when David A. Dunlap was inspired by a lecture hosted by Professor <strong>Clarence Chant</strong>, founder of what was then the newly established department of astronomy.</p> <p>After Dunlap鈥檚 death, his widow, <strong>Jessie Donalda Dunlap</strong>, made a gift in her late husband鈥檚 honour, resulting in the establishment of the David Dunlap Observatory in 1935. A 76-hectare property in Richmond Hill and the world鈥檚 second-largest telescope at the time provided the foundation for cutting-edge astronomical research, including being the first observatory to prove the existence of black holes.</p> <p>Over the years, increasing light pollution began to affect visibility from the observatory. In 2008, members of the Dunlap family agreed to the sale of the property. David M. Dunlap and J. Moffat Dunlap鈥檚 subsequent endowed gift to U&nbsp;of&nbsp;T resulted in the establishment of the&nbsp;<a href="https://www.dunlap.utoronto.ca/" rel="noopener noreferrer" target="_blank">Dunlap Institute for Astronomy &amp; Astrophysics</a>. The institute resides on U&nbsp;of&nbsp;T鈥檚 St. George campus, alongside the department of astronomy and astrophysics 鈥 which was renamed to encompass astrophysics in 2001鈥 and the&nbsp;<a href="https://www.cita.utoronto.ca/" rel="noopener noreferrer" target="_blank">Canadian Institute for Theoretical Astrophysics</a>&nbsp;(CITA).</p> <p>鈥淭he Dunlap family鈥檚 long-standing support of the University of Toronto has been exemplary and transformative,鈥 says Woodin. 鈥淚t is because of donors like the Dunlap family that U&nbsp;of&nbsp;T is able to continue making leaps forward in scientific research and discovery.鈥</p> <p>The reception honoured David and Moffat for&nbsp;<a href="https://boundless.utoronto.ca/impact/from-beautiful-dream-to-lasting-legacy/">their family鈥檚 legacy of inspiring generosity and unwavering commitment</a>&nbsp;to the advancement of astronomical research and discovery.</p> <p>鈥淥ur family鈥檚 much-loved connection to the University of Toronto began with our grandfather鈥檚 vision,鈥 says David. 鈥淥ver the years, we鈥檝e been able to see the impact of our family鈥檚 gifts in the form of important and remarkable developments in astronomy at U&nbsp;of&nbsp;T. We are very happy to be able to celebrate his memory in this meaningful way.鈥</p> <p>Over the past century, the department has secured its place at the forefront of astronomy and astrophysics, both in Canada and internationally. Students and faculty&nbsp;<a href="https://boundless.utoronto.ca/impact/telephoto-array/">investigate distant galaxies</a>, dark energy and the origins of the universe 鈥 from interdisciplinary strategies for&nbsp;<a href="https://www.artsci.utoronto.ca/news/age-really-big-data-astrostatistician-gwen-eadie-exploring-cosmos-telescopes-and-statistics" rel="noopener noreferrer" target="_blank">determining the mass of the Milky Way galaxy</a>, to research expeditions to Antarctica to&nbsp;<a href="https://www.artsci.utoronto.ca/news/astronomy-graduate-student-matt-young-probes-beginning-universe-bottom-world" rel="noopener noreferrer" target="_blank">observe light from the universe when it was 380,000 years old</a>&nbsp;through the South Pole Telescope.</p> <p>Professor <strong>Raymond Carlberg</strong>, chair of the David A. Dunlap Department of Astronomy and Astrophysics, is looking forward to the future. 鈥淭he department has made many exciting discoveries and advances in recent years,鈥 says Carlberg, 鈥渁nd thanks to the support of the Dunlap family, this is just the beginning.鈥</p> </div> <div class="field field--name-field-news-home-page-banner field--type-boolean field--label-above"> <div class="field__label">News home page banner</div> <div class="field__item">Off</div> </div> Fri, 20 Dec 2019 15:40:01 +0000 Christopher.Sorensen 161423 at 茄子直播 astrophysicist Ue-Li Pen on first-ever image of a black hole and the international collaboration behind it /news/u-t-astrophysicist-ue-li-pen-first-ever-image-black-hole-and-international-collaboration-behind <span class="field field--name-title field--type-string field--label-hidden">茄子直播 astrophysicist Ue-Li Pen on first-ever image of a black hole and the international collaboration behind it</span> <div class="field field--name-field-featured-picture field--type-image field--label-hidden field__item"> <img loading="eager" srcset="/sites/default/files/styles/news_banner_370/public/A-Consensus-crop.jpg?h=afdc3185&amp;itok=rei74Fc1 370w, /sites/default/files/styles/news_banner_740/public/A-Consensus-crop.jpg?h=afdc3185&amp;itok=m5erq6ll 740w, /sites/default/files/styles/news_banner_1110/public/A-Consensus-crop.jpg?h=afdc3185&amp;itok=xRxQQzhb 1110w" sizes="(min-width:1200px) 1110px, (max-width: 1199px) 80vw, (max-width: 767px) 90vw, (max-width: 575px) 95vw" width="740" height="494" src="/sites/default/files/styles/news_banner_370/public/A-Consensus-crop.jpg?h=afdc3185&amp;itok=rei74Fc1" alt="Photo of a black hole at the centre of the Messier 87 galaxy"> </div> <span class="field field--name-uid field--type-entity-reference field--label-hidden"><span>geoff.vendeville</span></span> <span class="field field--name-created field--type-created field--label-hidden"><time datetime="2019-04-10T16:36:53-04:00" title="Wednesday, April 10, 2019 - 16:36" class="datetime">Wed, 04/10/2019 - 16:36</time> </span> <div class="clearfix text-formatted field field--name-field-cutline-long field--type-text-long field--label-above"> <div class="field__label">Cutline</div> <div class="field__item">The first-ever image of a black hole, at the center of the Messier 87 galaxy, was captured through a broad international collaboration that included 茄子直播 researcher Ue-Li Pen (photo courtesy of U.S. National Science Foundation)</div> </div> <div class="field field--name-field-author-reporters field--type-entity-reference field--label-hidden field__items"> <div class="field__item"><a href="/news/authors-reporters/geoffrey-vendeville" hreflang="en">Geoffrey Vendeville</a></div> </div> <div class="field field--name-field-topic field--type-entity-reference field--label-above"> <div class="field__label">Topic</div> <div class="field__item"><a href="/news/topics/global-lens" hreflang="en">Global Lens</a></div> </div> <div class="field field--name-field-story-tags field--type-entity-reference field--label-hidden field__items"> <div class="field__item"><a href="/news/tags/canadian-institute-theoretical-astrophysics" hreflang="en">Canadian Institute for Theoretical Astrophysics</a></div> <div class="field__item"><a href="/news/tags/dunlap-institute-astronomy-astrophysics" hreflang="en">Dunlap Institute for Astronomy &amp; Astrophysics</a></div> <div class="field__item"><a href="/news/tags/faculty-arts-science" hreflang="en">Faculty of Arts &amp; Science</a></div> <div class="field__item"><a href="/news/tags/global" hreflang="en">Global</a></div> <div class="field__item"><a href="/news/tags/research-innovation" hreflang="en">Research &amp; Innovation</a></div> </div> <div class="clearfix text-formatted field field--name-body field--type-text-with-summary field--label-hidden field__item"><p>The&nbsp;appearance of a black hole has been the stuff of scientists' predictions and sci-fi writers' imaginations 鈥&nbsp;until today.</p> <p>In press conferences held on three continents, an international team of scientists announced they had taken the first-ever picture&nbsp;of a gargantuan black hole. The Event Horizon Telescope (EHT) collaboration, involving eight ground-based telescopes across the globe, targeted two supermassive black holes: Sagittarius A*, which is 26,000 light-years from Earth at the centre of the Milky Way, and one in Messier 87, a giant elliptical galaxy in the constellation Virgo.&nbsp;</p> <p>The scientists successfully captured an image of the black hole and its shadow in M87. The black hole is 55 million light-years from Earth and has a mass 6.5 billion times that of our sun.</p> <p>"If immersed in a bright region, like a disc of glowing gas, we expect a black hole to create a dark region similar to a shadow 鈥&nbsp;something predicted by Einstein鈥檚 general relativity that we鈥檝e never seen before,鈥 said&nbsp;Heino Falcke of Radboud University, the chair of the EHT Science Council, in a news release.</p> <p>"This shadow, caused by the gravitational bending and capture of light by the event horizon, reveals a lot about the nature of these fascinating objects and allowed us to measure the enormous mass of M87鈥檚 black hole."</p> <p>As interim director of the University of Toronto鈥檚&nbsp;Canadian Institute for Theoretical Astrophysics, Professor&nbsp;<strong>Ue-Li Pen&nbsp;</strong>played an administrative role in the global collaboration that brought these black holes into focus.</p> <p>Pen, who is also an associate faculty member&nbsp;at 茄子直播's Dunlap Institute for Astronomy &amp; Astrophysics,&nbsp;spoke to <em>茄子直播 News </em>about the scientific team effort that generated our first look at a black hole.</p> <hr> <p><img alt class="media-image attr__typeof__foaf:Image img__fid__10638 img__view_mode__media_large attr__format__media_large" height="453" src="/sites/default/files/ue-li-%28embed%29.jpg" typeof="foaf:Image" width="680" loading="lazy"></p> <p><em>(photo by Geoffrey Vendeville)&nbsp;</em></p> <p><strong>Who are the scientists working in the Event Horizon Telescope collaboration and what are they doing?&nbsp;</strong></p> <p>It's a collaboration of hundreds of over 200 scientists from 13 institutions and many countries. It's a global initiative. In order to have such a high-resolution image, which has never been done before, you use the Earth's size as your telescope. You're connecting telescopes across the planet to make one coherent image.</p> <p>The telescopes involved are in Chile, Spain, the U.S., Mexico and Hawaii. There is another at the South Pole used indirectly for calibration.</p> <p><strong>How do these telescopes work together?</strong></p> <p>They simultaneously observe the object through a technique called VLBI (Very Long Baseline Interferometry). They record the voltages of the light,&nbsp;you ship the disks to one place and you combine the voltages to form an image. At the end of the day, this is the image of a black hole.&nbsp;</p> <p><strong>The scientists looked at two black holes specifically. One in our galaxy and another in a neighbouring galaxy. Why did they choose these two?&nbsp;</strong></p> <p>These are the largest black holes as measured in angular size in the sky. So the one in our galaxy, of course, looks large because it's nearby, and the other is intrinsically much bigger but further away, but similar in angular size.&nbsp;</p> <p><strong>Can you explain what's meant by the event horizon?&nbsp;</strong></p> <p>It's the boundary around a black hole 鈥 the&nbsp;point of no return. Things can only go in and never come out. It's a one-way street.</p> <p><strong>So how can we take a picture of a black hole, if even light disappears beyond the event horizon?&nbsp;</strong></p> <p>By picture, we mean a shadow. The black hole is this black thing in the middle where no light is coming from. It is the absence of light that makes you say it's a black hole.&nbsp;</p> <p><strong>What is the ring we see around it?&nbsp;</strong></p> <p>It's a lensed image of matter that's falling into the black hole. It is bright on one side because some of the matter is moving toward it as it orbits around the black hole.&nbsp;The matter on one side is moving toward us and the matter on the other side is moving away. The Doppler shift makes this side look brighter.&nbsp;</p> <p><strong>Black holes often appear in science fiction as a scary phenomenon. Do we have any reason to fear that we will be sucked into a black hole anytime soon?&nbsp;</strong></p> <p>Unlikely. It's unlikely that there is any black hole nearby. We are searching very hard and these are all very far away.&nbsp;</p> <p><strong>What were some of&nbsp;the challenges involved in getting pictures of a black hole?&nbsp;</strong></p> <p>There was a combination of challenges. The two biggest telescopes were not really completed until a few years ago. The two big players are the Large Millimeter Telescope in Mexico 鈥&nbsp;I visited that telescope last spring 鈥&nbsp;that's the world's biggest telescope at that wavelength. The other is the ALMA&nbsp; telescope (Atacama Large Millimeter/submillimeter Array) that was recently finished and only recently has had the ability to take data in the right form.&nbsp;</p> <p>They also had to overcome technological challenges observing at these high frequencies. The data rate is enormous. Being able to process it wasn't possible until a few years ago.&nbsp;</p> <p><strong>How did you react when you first saw the pictures of the black hole? Were you surprised?&nbsp;</strong></p> <p>Surprised is probably the wrong word because this was kind of known since Einstein's days. It confirms the theory that was proposed 100 years ago. In that sense, it's not surprising. It's like the <a href="/news/making-waves-how-uoft-made-discovery-gravitational-waves-possible">LIGO event a few years ago</a> (the direct observation of gravitational waves) that was also predicted by Einstein.&nbsp;</p> <p>What I personally find interesting, which may not be the same as what my colleagues think, is that it gives us, for the first time, the ability to use a black hole as a tool.&nbsp;</p> <p><strong>What do you mean?</strong></p> <p>What we're seeing is the lensing effect of the black hole, meaning we're seeing the black hole bending and absorbing light.&nbsp;The ring you see is actually stuff on the far side of the black hole that went around the black hole and comes toward you.&nbsp;</p> <p>That opens the path to use black holes as a new tool. One of the things I'm interested in is thinking of ways of understanding the nature of space-time, quantum gravity. This is the first step. This is not the end 鈥 it's the beginning of a way of measuring black holes.&nbsp;</p> <p><strong>What are the next questions people are going to be asking about black holes?&nbsp;</strong></p> <p>I think the big question that was even evident in Einstein's days was: What happens with quantum mechanics and gravity?&nbsp;</p> <p>We don't know how to reconcile the nature of quantum mechanics, which is a probabilistic description of the world, with general relativity, which is a deterministic description. There's a mystery, and the black hole is a place where these two effects come head-to-head.</p> <p><strong>In other words, we might be able to observe phenomena that explain or offer some clues into quantum mechanics and gravity?&nbsp;</strong></p> <p>Exactly 鈥 how these two interact.</p> <p><strong>How much time and effort went into this collaboration?&nbsp;</strong></p> <p>If you look at how science happens, it's often through long-term efforts. It's one of those things that in our society is not that appreciated, and which our political system makes difficult to set up.&nbsp;</p> <p>Einstein theorized this 100 years ago, and it's been a 100-year path to get here. This is a long-term effort. Even the Event Horizon Telescope collaboration took 10 years&nbsp;to set up this network of telescopes. The telescopes weren't built for the collaboration. It was an international effort, and that's something that requires a lot of positive will from people of different backgrounds, with different ideas and different funding schemes. They had to be committed for the long term.</p> <p>That's something which I think we need more of. The world would be a better place if we could work together.&nbsp;</p> </div> <div class="field field--name-field-news-home-page-banner field--type-boolean field--label-above"> <div class="field__label">News home page banner</div> <div class="field__item">Off</div> </div> Wed, 10 Apr 2019 20:36:53 +0000 geoff.vendeville 156165 at A decade of the Dunlap Institute: 'We鈥檙e not only celebrating a 10-year anniversary, but a 100-year conversation' /news/celebrating-decade-dunlap-institute-we-re-not-only-celebrating-10-year-anniversary-100-year <span class="field field--name-title field--type-string field--label-hidden">A decade of the Dunlap Institute: 'We鈥檙e not only celebrating a 10-year anniversary, but a 100-year conversation'</span> <div class="field field--name-field-featured-picture field--type-image field--label-hidden field__item"> <img loading="eager" srcset="/sites/default/files/styles/news_banner_370/public/2019-01-17-dunlap-venus-resized.jpg?h=58088d8b&amp;itok=x-5h8t3S 370w, /sites/default/files/styles/news_banner_740/public/2019-01-17-dunlap-venus-resized.jpg?h=58088d8b&amp;itok=kstPe69w 740w, /sites/default/files/styles/news_banner_1110/public/2019-01-17-dunlap-venus-resized.jpg?h=58088d8b&amp;itok=mVcv9Qry 1110w" sizes="(min-width:1200px) 1110px, (max-width: 1199px) 80vw, (max-width: 767px) 90vw, (max-width: 575px) 95vw" width="740" height="494" src="/sites/default/files/styles/news_banner_370/public/2019-01-17-dunlap-venus-resized.jpg?h=58088d8b&amp;itok=x-5h8t3S" alt="Photo of viewing of transit of Venus"> </div> <span class="field field--name-uid field--type-entity-reference field--label-hidden"><span>noreen.rasbach</span></span> <span class="field field--name-created field--type-created field--label-hidden"><time datetime="2019-01-17T15:19:02-05:00" title="Thursday, January 17, 2019 - 15:19" class="datetime">Thu, 01/17/2019 - 15:19</time> </span> <div class="clearfix text-formatted field field--name-field-cutline-long field--type-text-long field--label-above"> <div class="field__label">Cutline</div> <div class="field__item">The Dunlap Institute has sparked a love of astronomy in tens of thousands through events like viewing the last transit of Venus in 2012 (photo by Chris Sasaki)</div> </div> <div class="field field--name-field-author-reporters field--type-entity-reference field--label-hidden field__items"> <div class="field__item"><a href="/news/authors-reporters/chris-sasaki" hreflang="en">Chris Sasaki</a></div> </div> <div class="field field--name-field-topic field--type-entity-reference field--label-above"> <div class="field__label">Topic</div> <div class="field__item"><a href="/news/topics/our-community" hreflang="en">Our Community</a></div> </div> <div class="field field--name-field-story-tags field--type-entity-reference field--label-hidden field__items"> <div class="field__item"><a href="/news/tags/alumni" hreflang="en">茄子直播</a></div> <div class="field__item"><a href="/news/tags/astronomy-astrophysics" hreflang="en">Astronomy &amp; Astrophysics</a></div> <div class="field__item"><a href="/news/tags/canadian-institute-theoretical-astrophysics" hreflang="en">Canadian Institute for Theoretical Astrophysics</a></div> <div class="field__item"><a href="/news/tags/dunlap-institute-astronomy-astrophysics" hreflang="en">Dunlap Institute for Astronomy &amp; Astrophysics</a></div> <div class="field__item"><a href="/news/tags/faculty-arts-science" hreflang="en">Faculty of Arts &amp; Science</a></div> </div> <div class="clearfix text-formatted field field--name-body field--type-text-with-summary field--label-hidden field__item"><p>University of Toronto President <strong>Meric Gertler </strong>and Faculty of Arts &amp; Science Dean <strong>David Cameron </strong>hosted <strong>David</strong> and <strong>Moffat Dunlap</strong> and members of the Dunlap family at a gala dinner last month to cap off the 10<sup>th&nbsp;</sup>anniversary of the Dunlap Institute for Astronomy &amp; Astrophysics.</p> <p>The Dunlap Institute, established in 2008, joined the department of astronomy and astrophysics and the Canadian Institute for Theoretical Astrophysics (CITA) at 茄子直播 to form the leading centre for astronomical research in Canada.</p> <p><a href="http://www.dunlap.utoronto.ca/dunlap-10th-anniversary-timeline/">In the decade that followed</a>, Dunlap grew to increasingly deliver on its mandate to develop innovative astronomical technology, conduct groundbreaking research, train the next generation of astronomers, and share the excitement of astronomy with the public.</p> <p>Also in attendance was CITA鈥檚<strong> Peter Martin</strong>, who was instrumental in founding the institute. 鈥淭he Dunlap Institute is strongly rooted in traditions associated with the Dunlap name,鈥 Martin said. 鈥淭he institute has touched many, nationally and internationally, through its innovative and ambitious research, training, and education programs. What a wonderful start over the first decade.鈥</p> <p>The dinner also acknowledged the long and historic relationship between the Dunlap family and the university,&nbsp; which began in 1921 when David and Moffat鈥檚 grandfather, <strong>David A. Dunlap</strong>, met <strong>Clarence Chant</strong>, founder of 茄子直播鈥檚 department of astronomy, at an astronomy lecture given by Chant.</p> <p>In 1926, Dunlap鈥檚 widow, Jessie Donalda Dunlap donated funds in memory of her late husband that made possible the Dunlap Observatory in Richmond Hill. Then, in 2007, an endowed gift from David and Moffat led to the establishment the Dunlap Institute.</p> <h3><a href="http://www.dunlap.utoronto.ca/dunlap-10th-anniversary-timeline/">10 years of the Dunlap Institute: A timeline</a></h3> <p>In the words of the institute鈥檚 current director, <strong>Bryan Gaensler</strong>, 鈥淲e鈥檙e not only celebrating a 10-year anniversary, but a 100-year conversation.鈥</p> <p>Today, the research themes of the institute have grown to encompass optical, infrared and radio instrumentation; data analysis; dark energy; large-scale structure in the universe; the Cosmic Microwave Background; the interstellar medium; galaxy evolution; and cosmic magnetism.</p> <p>Dunlap scientists play leading roles in Canadian and international collaborations destined to make groundbreaking discoveries for decades to come, including the&nbsp;Canadian Hydrogen Intensity Mapping Experiment (CHIME), the Dragonfly Telescope Array, the Square Kilometre Array, the Large Synoptic Survey Telescope, the South Pole Telescope, and many others.</p> <p>Dunlap鈥檚 annual Astronomical Instrumentation Summer School for undergraduate and graduate students from around the world has been the institute鈥檚 flagship training initiative since 2012. And the Dunlap Institute has sparked a love of astronomy in tens of thousands through events like Astronomy on Tap T.O., and through opportunities to view the 2012 transit of the Venus, the 2015 Supermoon total lunar eclipse, and the 2017 solar eclipse.</p> <p>鈥淭he first 10 years of the Dunlap Institute were about figuring out what we want to do and then finding the right people to do it,鈥 Gaensler said. 鈥淲e now have a clear plan for the future and a superb team on board, and we鈥檙e ready to put our foot to the floor. Brace yourselves for an upcoming torrent of new discoveries and talented young researchers.鈥</p> <p>&nbsp;</p> </div> <div class="field field--name-field-news-home-page-banner field--type-boolean field--label-above"> <div class="field__label">News home page banner</div> <div class="field__item">Off</div> </div> Thu, 17 Jan 2019 20:19:02 +0000 noreen.rasbach 151357 at Look up! Check out 茄子直播鈥檚 musical exploration of the night sky and these other Nuit Blanche events /news/look-check-out-u-t-s-musical-exploration-night-sky-and-these-other-nuit-blanche-events <span class="field field--name-title field--type-string field--label-hidden">Look up! Check out 茄子直播鈥檚 musical exploration of the night sky and these other Nuit Blanche events</span> <div class="field field--name-field-featured-picture field--type-image field--label-hidden field__item"> <img loading="eager" srcset="/sites/default/files/styles/news_banner_370/public/Matt-and-dome-1140-x-760.jpg?h=afdc3185&amp;itok=TpNVmAsm 370w, /sites/default/files/styles/news_banner_740/public/Matt-and-dome-1140-x-760.jpg?h=afdc3185&amp;itok=JjlC_7p0 740w, /sites/default/files/styles/news_banner_1110/public/Matt-and-dome-1140-x-760.jpg?h=afdc3185&amp;itok=MPgQsVR0 1110w" sizes="(min-width:1200px) 1110px, (max-width: 1199px) 80vw, (max-width: 767px) 90vw, (max-width: 575px) 95vw" width="740" height="494" src="/sites/default/files/styles/news_banner_370/public/Matt-and-dome-1140-x-760.jpg?h=afdc3185&amp;itok=TpNVmAsm" alt="Matt Russo and Andrew Santaguida "> </div> <span class="field field--name-uid field--type-entity-reference field--label-hidden"><span>Romi Levine</span></span> <span class="field field--name-created field--type-created field--label-hidden"><time datetime="2018-09-28T00:00:00-04:00" title="Friday, September 28, 2018 - 00:00" class="datetime">Fri, 09/28/2018 - 00:00</time> </span> <div class="clearfix text-formatted field field--name-field-cutline-long field--type-text-long field--label-above"> <div class="field__label">Cutline</div> <div class="field__item">茄子直播's Matt Russo (right) with friend and bandmate Andrew Santaguida in the portable planetarium they built for their Nuit Blanche installation (photo courtesy of Matt Russo)</div> </div> <div class="field field--name-field-author-reporters field--type-entity-reference field--label-hidden field__items"> <div class="field__item"><a href="/news/authors-reporters/romi-levine" hreflang="en">Romi Levine</a></div> </div> <div class="field field--name-field-topic field--type-entity-reference field--label-above"> <div class="field__label">Topic</div> <div class="field__item"><a href="/news/topics/city-culture" hreflang="en">City &amp; Culture</a></div> </div> <div class="field field--name-field-story-tags field--type-entity-reference field--label-hidden field__items"> <div class="field__item"><a href="/news/tags/canadian-institute-theoretical-astrophysics" hreflang="en">Canadian Institute for Theoretical Astrophysics</a></div> <div class="field__item"><a href="/news/tags/cities" hreflang="en">Cities</a></div> <div class="field__item"><a href="/news/tags/dunlap-institute-astronomy-astrophysics" hreflang="en">Dunlap Institute for Astronomy &amp; Astrophysics</a></div> <div class="field__item"><a href="/news/tags/faculty-arts-science" hreflang="en">Faculty of Arts &amp; Science</a></div> <div class="field__item"><a href="/news/tags/faculty-medicine" hreflang="en">Faculty of Medicine</a></div> <div class="field__item"><a href="/news/tags/u-t-scarborough" hreflang="en">茄子直播 Scarborough</a></div> </div> <div class="clearfix text-formatted field field--name-body field--type-text-with-summary field--label-hidden field__item"><p>Imagine a time in Toronto before city lights and skyscrapers, when you could look up and see the night sky, bright with stars and planets.</p> <p><strong>Matt Russo</strong> wants to give Torontonians a taste of what the city was like before light pollution with his <a href="http://www.system-sounds.com/one-sky/"><em>One Sky</em> installation at this year鈥檚 Nuit Blanche</a>,&nbsp;the all-night art festival that begins on Saturday evening.</p> <p>The astrophysicist and planetarium operator at University of Toronto鈥檚 Dunlap Institute&nbsp;for Astronomy &amp; Astrophysics in the Faculty of Arts &amp; Science&nbsp;has teamed up with the institute and his friend and bandmate Andrew Santaguida to build an outdoor planetarium where you can see 鈥 and hear 鈥 the night sky.</p> <p>鈥淭he night sky is something that can unite everyone,鈥 says Russo. 鈥淓veryone has access to the same sky and every culture realized that early on. They wanted to understand the motions of the night sky and what it means for them.</p> <p>鈥淲ith this exhibit, we're trying to bring together all those experiences into a unified whole.鈥</p> <p><iframe allow="autoplay; encrypted-media" allowfullscreen frameborder="0" height="422" src="https://www.youtube.com/embed/d6wmgqaDbeo" width="750"></iframe></p> <p>Not only will people visiting the installation be able to see the twinkling stars,&nbsp;they鈥檒l be able to hear them too. <em>One Sky</em>&nbsp;comes out of the&nbsp;musical venture <a href="/news/u-t-astrophysicists-make-music-moons-and-rings-saturn">SYSTEM Sounds</a>, whose members include&nbsp;Russo, Santaguida and <strong>Dan Tamayo</strong>, a postdoctoral researcher at the Canadian Institute for Theoretical Astrophysics and the Centre for Planetary Sciences at 茄子直播 Scarborough. The group creates music out of the movements of the universe.</p> <p>鈥淭he music is out there,鈥 Russo previously told <em>茄子直播 News</em>. 鈥淚'm just finding a way to make it audible. It's kind of like there's an electric guitar in space and I'm plugging in the cable.鈥</p> <p>Russo is particularly interested in providing people who are partially sighted and blind an opportunity to experience the universe through sound. He鈥檚 been working with various groups including the Canadian Council of the Blind over the past year to fine tune that experience.</p> <p>Earlier this year, Russo made headlines with his planetarium show <em>Our Musical Universe</em>, which gave attendees a multi-sensory experience of the cosmos. <em>One Sky</em> aims to do this on a larger scale.</p> <p>鈥淭his is the main event,鈥 says Russo.</p> <h3><a href="/news/u-t-astrophysicist-musician-helps-blind-partially-sighted-experience-cosmos-musical-planetarium">Read more about <em>Our Musical Universe</em></a></h3> <p>Replicating the sights and sounds of the universe for Nuit Blanche was no easy task, says Russo.</p> <p>鈥淭here's no outdoor dome in Toronto so we had to build our own,鈥 he says. 鈥淭hat meant we had to learn everything about geodesic domes and projections.鈥</p> <p>The geodesic dome is built out of PVC pipes assembled in geometric shapes, making the structure light but strong.</p> <p>Russo, Santaguida and a group of Dunlap volunteers are also going to have to find novel ways to power through the all-night event.</p> <p>鈥淲e have to be there all of Friday putting it up, and then Saturday overnight and then Sunday taking it down,鈥 says Russo.&nbsp; 鈥淚'm going to make sure we have plenty of pillows and sheets in the lounge so we can sneak away and take little power naps throughout the night.鈥</p> <p><a href="https://nbto.com/project.html?project_id=697">Check out <em>One Sky</em> at the Dunlap courtyard on 50 St. George St.</a></p> <hr> <h4>There鈥檚 more to explore at Nuit Blanche. Grab another cup of coffee and head over to these installations created by 茄子直播 community members:</h4> <p>Faculty of Medicine student <strong>Angela Qin</strong>鈥檚 sculpture <a href="https://nbto.com/project.html?project_id=689"><em>The Doctor鈥檚 Bag(gage)</em></a> will be featured as part of the Not Just Tourists Toronto installation. Qin is raising awareness about the rising rates of burnout and suicide among health-care professionals.&nbsp;</p> <p>Two&nbsp;artists at the University of Toronto Scarborough are fusing sound design, engineering and art in a two-part exhibit called <a href="/news/u-t-artists-connect-scarborough-downtown-sound-installation-part-nuit-blanche"><em>Long Distance Relationship</em></a>. The installation connects people at the Campbell House Museum in downtown Toronto with visitors at the Scarborough Civic Centre, eliminating the 鈥渟tigmas that separate us,鈥 says one of the artists.</p> <p>&nbsp;</p> </div> <div class="field field--name-field-news-home-page-banner field--type-boolean field--label-above"> <div class="field__label">News home page banner</div> <div class="field__item">Off</div> </div> Fri, 28 Sep 2018 04:00:00 +0000 Romi Levine 143771 at