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SUMMARY: The physics of AGN feedback in galaxy clusters - Prof. Christophe
 r Reynolds ( Department of Astronomy\, University of Maryland\, USA)
DTSTART:20150428T120000Z
DTEND:20150428T130000Z
UID:TALK58297@talks.cam.ac.uk
CONTACT:Jean Teyssandier
DESCRIPTION:Cooling-core galaxy clusters give us a unique opportunity to s
 tudy an important aspect of galaxy formation — we believe that energy in
 jection by the active galactic nucleus (AGN) in the central galaxy prevent
 s catastrophic cooling of the intracluster medium (ICM)\, essentially trun
 cating growth of these massive galaxies.  After briefly reviewing these ar
 guments\, I shall discuss the theoretical questions that arise when one at
 tempts to understand the detailed physics of AGN heating and regulation.  
 At every level of description\, the ICM/AGN system proves to be rich in ph
 ysics.   If the ICM is considered within simple hydrodynamics\, questions 
 arise as to how the AGN energy is thermalized and whether/how it drives bu
 lk ICM turbulence.   Adding magnetic fields and transport processes to our
  description (i.e. a Braginskii-MHD picture)\, the ICM atmosphere becomes 
 plagued by new convective instabilities that can strongly affect the ICM t
 hermodynamics.  Finally\, I will argue that plasma-scale kinetic physics m
 ay have some important consequences for the ICM thermodynamics.  Prelimina
 ry results from particle-in-cell plasma simulations relevant to the ICM wi
 ll be presented.
LOCATION:MR14\,  Centre for Mathematical Sciences\, Wilberforce Road\, Cam
 bridge
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