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SUMMARY:The physics of AGN feedback in galaxy clusters - Christopher Reyno
 lds\, University of Maryland
DTSTART:20150226T163000Z
DTEND:20150226T173000Z
UID:TALK57138@talks.cam.ac.uk
CONTACT:Simon Hodgkin
DESCRIPTION:Cooling-core galaxy clusters give us a unique opportunity to\n
 study an important aspect of galaxy formation — we believe that energy\n
 injection by the active galactic nucleus (AGN) in the central galaxy\nprev
 ents catastrophic cooling of the intracluster medium (ICM)\, essentially t
 runcating growth of these massive galaxies.  After briefly reviewing these
  arguments\, I shall discuss the theoretical questions that arise when one
  attempts to understand the detailed physics of AGN heating and regulation
 . At every level of description\, the ICM/AGN system proves to be rich in 
 physics.   If the ICM is considered within simple hydrodynamics\, question
 s arise as to how the AGN energy is thermalized and whether/how it drives 
 bulk ICM turbulence.   Adding magnetic fields and transport processes to o
 ur description (i.e. a Braginskii-MHD picture)\, the ICM atmosphere become
 s\nplagued by new convective instabilities that can strongly affect the IC
 M\nthermodynamics.  Finally\, I will argue that plasma-scale kinetic physi
 cs may\nhave some important consequences for the ICM thermodynamics.  Prel
 iminary\nresults from particle-in-cell plasma simulations relevant to the 
 ICM will be\npresented.
LOCATION:Sackler Lecture Theatre\, IoA (tea at 4:00 pm)
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