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VERSION:2.0
CALSCALE:GREGORIAN
PRODID:UW-Madison-Physics-Events
BEGIN:VEVENT
SEQUENCE:0
UID:UW-Physics-Event-1692
DTSTART:20091201T213000Z
DTEND:20091201T230000Z
DTSTAMP:20260428T061200Z
LAST-MODIFIED:20091112T141635Z
LOCATION:3425 Sterling Hall
SUMMARY:The Invisibles: Revealing dark matter and the lower limit on g
 alaxy Formation\, Astronomy Colloquium\, Beth Willman\, Haverford Coll
 ege
DESCRIPTION:Tracking the growth of stellar mass in galaxies is a funda
 mental characterization of the galaxy population. Recent observations 
 have shown that the total mass in L>L* red galaxies has increased by a
  factor of ~2 at z<1\, although at different rates as a function of ga
 laxy mass. Despite the advance made by these studies of the whole gala
 xy population\, until recently it has not been clear if the growth of 
 the red sequence depended on environment. Galaxy clusters are a useful
  probe of this as they sample the most extreme environments. However\,
  progress toward answering this question has been hampered by a lack o
 f deep multi-band imaging of a large sample of clusters that can be we
 ll linked to those in the local universe. To address this I will prese
 nt the evolution of the red sequence as measured in 16 intermediate re
 dshift clusters drawn from the ESO Distant Cluster Survey (EDisCS). Un
 like massive x-ray selected clusters\, these clusters have velocity di
 spersions that make them likely progenitors of clusters that populate 
 the local Universe. I will show how the luminosity function (LF) of re
 d-sequence galaxies in these clusters has evolved over 50% of cosmic t
 ime\, highlighting the rapid buildup of the faint cluster galaxy popul
 ation. I will also compare the evolution of the red sequence in cluste
 rs to the evolution of the field red sequence population and show that
  they evolve at different rates. Finally I will address how the total 
 mass on the red sequence evolves in clusters and will use this to cons
 train the mechanisms of how red galaxies can be added to clusters. Fro
 m this analysis it appears likely that some fraction of the light in r
 ecently added cluster red sequence galaxies is currently in the in the
  form of intracluster stars.
URL:https://www.physics.wisc.edu/events/?id=1692
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