<html><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;" class="">Dear all,<br class=""><div><div class=""><div style="word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;" class=""><div style="word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;" class=""><br class="">The next SU astronomy departmental seminar will take place on <b class="">Friday April 14th at 10:30 in room FC61</b> (AlbaNova building, 6th floor) <b class="">and on zoom (<a href="https://stockholmuniversity.zoom.us/s/61002076352" class="" style="font-weight: normal;">https://stockholmuniversity.zoom.us/s/61002076352</a>).<br class=""></b><br class="">———————————<div class=""><div class=""><b class="">Speaker: Charlotte Mason (DAWN, NBI U. Copenhagen)</b><br class=""><b class="">Title: </b><b class="">Chasing Cosmic Dawn and Reionization<br class=""></b><a href="https://www.albanova.se/event/astronomy-departmental-seminar-kelley-hess-csic/" class="">https://www.albanova.se/event/astronomy-departmental-seminar-charlotte-mason-dawn/</a></div><div class=""><br class="">Abstract:</div><div class="">The newly launched James Webb Space Telescope (JWST) has expanded our cosmic horizon to the first few hundred million years after the Big Bang, enabling us to observe the build up of the first galaxies. These first galaxies fundamentally altered their surroundings by 're'-ionizing intergalactic hydrogen. I will describe how this reionization process is still poorly understood, but how identifying when reionization began and which population of galaxies dominated the process is key to constraining poorly understood astrophysics of galaxy formation (e.g. massive star formation and feedback processes). Excitingly, an excess of luminous galaxy candidates just 500 million years after the Big Bang has been discovered in early JWST data, which exceeds theoretical predictions. I will discuss how the new JWST observations test theoretical models and possible solutions. I will present efforts to constrain the timeline of reionization, which favour a late and rapid end to reionization. I will discuss how JWST observations of Lyman alpha emission at z>8 challenge these results and discuss the implications for our understanding of early star formation.<br class=""><div class="">———————————</div><div class=""><div class=""><br class="">We look forward to seeing many of you there. Thanks!<br class=""><br class="">Eliot and Kris</div><div class=""><br class=""><br class="">Upcoming Events:<br class=""><br class=""></div><div class="">2023-04-21<span class="Apple-tab-span" style="white-space:pre"> </span>Tadafumi Matsuno (Kapteyn Institute, U. Groningen)</div><div class="">2023-04-26<span class="Apple-tab-span" style="white-space:pre"> </span>Alexandra Lereste (SU) <— Note this is on a Wednesday (time TBD)<br class="">2023-04-28<span class="Apple-tab-span" style="white-space:pre"> </span>Biwei Jiang (Beijing Normal University)</div><div class=""><br class=""></div><div class="">The calendar for later planned seminars is available <a href="https://ebox.su.se/owa/calendar/75d76b284ca84db1a85c4e021d1133e8@astro.su.se/22bc11d486d04afaa009a9730dd065d65524176602456481514/calendar.html" class="">here</a>.</div><div class="">(Please note that calendar can be subject to updates)</div><div class=""><br class="">———————————</div><div class="">Join Zoom Meeting:<br class=""><a href="https://stockholmuniversity.zoom.us/s/61002076352" class="">https://stockholmuniversity.zoom.us/s/61002076352</a></div><div class="">Meeting ID: 610 0207 6352</div></div></div></div></div></div></div><blockquote type="cite" class=""><div class=""><div style="word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;" class=""><div style="word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;" class=""><div class=""><div class=""><div class=""><div class=""><br class=""></div></div></div></div></div></div></div></blockquote></div><br class=""></body></html>