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VERSION:2.0
CALSCALE:GREGORIAN
PRODID:UW-Madison-Physics-Events
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SEQUENCE:0
UID:UW-Physics-Event-1522
DTSTART:20090505T203000Z
DURATION:PT1H0M0S
DTSTAMP:20260422T214701Z
LAST-MODIFIED:20090430T130754Z
LOCATION:6515 Sterling Hall
SUMMARY:The Power of Cooling Cores in Clusters in Galaxies\, Astronomy
  Colloquium\, Mateusz Ruszkowski\, University of Michigan
DESCRIPTION:A significant fraction of clusters of galaxies possess coo
 l cores. If uninhibited\, the cooling of the intracluster medium (ICM)
  will result in extreme mass accretion rates which is contrary to obse
 rvations. It is widely accepted now that active galactic nuclei (AGN)\
 , and possibly other processes\, &quot\;conspire&quot\; to heat the cl
 uster plasma and prevent such &quot\;cooling catastrophes&quot\;. Howe
 ver\, several aspects of this process are not understood. I will discu
 ss some of the outstanding problems of the energetics of cool cores in
  clusters of galaxies. More specifically\, I will discuss (1) the role
  of the brightest cluster galaxy and the mass of its central black hol
 e in supplying the energy\, (2) the impact of the energy transfer by t
 hermal conduction\, (3) the role of the magnetic fields in slowing the
  mixing of the hot AGN-inflated bubbles with the ICM and\, finally\, (
 4) I will briefly comment on our ongoing efforts to understand the rol
 e of anisotropic conduction in cosmological simulations of cluster for
 mation. <br><br>
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URL:https://www.physics.wisc.edu/events/?id=1522
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