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VERSION:2.0
CALSCALE:GREGORIAN
PRODID:UW-Madison-Physics-Events
BEGIN:VEVENT
SEQUENCE:0
UID:UW-Physics-Event-1513
DTSTART:20090421T203000Z
DTEND:20090421T220000Z
DTSTAMP:20260420T112048Z
LAST-MODIFIED:20090415T180948Z
LOCATION:6515 Sterling Hall
SUMMARY:A Census of Baryons in Groups and Clusters of Galaxies\, Astro
 nomy Colloquium\, Ann Zabludoff\, Univ of AZ\, Steward Observatory
DESCRIPTION:We have now discovered that intracluster stars are a signi
 ficant part of the stellar baryons in galaxy clusters and groups.  The
  detection of this previously unexplored baryonic component has conseq
 uences for the baryon budget of clusters and its relationship to the u
 niversal value obtained from WMAP observations of the cosmic microwave
  background radiation.<br>
\nBecause metals produced by intracluster s
 tars do not need to escape from galaxies\, but are instead directly in
 jected into the intergalactic medium\, the existence of this stellar p
 opulation also has significant consequences for the enrichment history
  of the hot\, X-ray-emitting\, intracluster gas.<br>
\nI will review o
 ur recent work characterizing the properties of<br>
\nintracluster sta
 rs\, as well as new constraints on missing baryons on the scales of cl
 usters and groups\, on whether it is possible to account for the high 
 metal content of the intracluster medium\, and on the mass profiles of
  the largest bound systems in the universe.<br>
\n<br>
\n
URL:https://www.physics.wisc.edu/events/?id=1513
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