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CATEGORIES:Institute of Astronomy Colloquia
SUMMARY:The Obscured Universe: from Peak Star-Formation to
  Reionization - Caitlin Casey (Univerity of Texas)
DTSTART;TZID=Europe/London:20200514T160000
DTEND;TZID=Europe/London:20200514T170000
UID:TALK141682AThttp://talks.cam.ac.uk
URL:http://talks.cam.ac.uk/talk/index/141682
DESCRIPTION:Although rare in the nearby Universe\, gas-rich ga
 laxies with extraordinary star-formation rates (10
 0-1000x the Milky Way\, at >100 Msun/year) represe
 nt the typical massive galaxy in the early Univers
 e 10 billion years ago.  These galaxies’ high star
 -formation rates are predominantly obscured by dus
 t which absorbs and re-radiates >95% of the energy
  from massive stars in the (sub)millimeter/far-inf
 rared\, hence they are often called dusty star-for
 ming galaxies (DSFGs).  Thanks to facilities like 
 the Herschel Space Observatory in the early 2010s\
 , we have successfully mapped the contribution of 
 such DSFGs to cosmic star-formation from z=0 back 
 to z=2\, where it appears they are factors of 1000
 x more common than they are locally and\, indeed\,
  dominate.  I will discuss current efforts underwa
 y with ALMA to take an unbiased census of complete
 ly obscured galaxies from z=2 towards the Epoch of
  Reionization.  The detection of incredibly dust-r
 ich systems (>10^9 Msun of dust) at these early ep
 ochs are key to understanding both the early forma
 tion mechanisms of dust (from supernovae\, AGB sta
 rs and via grain growth in the ISM) and the assemb
 ly history of the Universe’s most massive galaxies
  and their rich\, over dense environments.\n
LOCATION:ONLINE - Details will be sent by email
CONTACT:Dr Annelies Mortier
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