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SUMMARY: Non-gravitational entropy and energy `profiles' in clusters - Imp
 lications for AGN feedback and Pre-heating - Subhabrata Majumdar (Tata Ins
 titute)
DTSTART:20170728T103000Z
DTEND:20170728T113000Z
UID:TALK72267@talks.cam.ac.uk
CONTACT:Martin Haehnelt
DESCRIPTION:Non-gravitational feedback affects the nature of the intraclus
 ter medium (ICM). X-ray cooling of the ICM and in situ energy feedback fro
 m active galactic nuclei (AGNs) and supernovae\, as well as pre-heating of
  the gas at epochs preceding the formation of clusters\, are proposed mech
 anisms for such feedback. I will present the non-gravitational entropy inj
 ection profiles and resulting non-gravitational energy feedback profiles\,
  of the intra-cluster medium for a large\nsample of clusters using data  S
 Z (Planck) and X-Ray(ROSAT) observations\, from deep inside cluster cores 
 up to r200. This is the first estimate of 'feedback profiles' (and not onl
 y the mean feedback energy per particle) from observations.  Estimate of t
 he non-gravitational energy in the cluster cores and their correlation wit
 h radio observations (NRAO/VLA) strongly point at AGN (in situ) feedback. 
 Moreover\,\nwe show that for the sample as a whole and throughout the enti
 re radial range\, the non-gravitational entropy/energy profiles conclusive
 ly rule all ICM pre-heating scenarios.  We demonstrate the robustness of o
 ur results w.r.t sample selection\, X-Ray analysis procedures\, non-radiat
 ive entropy modelling.  Time permitting\, I will also demonstrate a new sc
 heme for identifying cool vs non-cool core clusters.\n
LOCATION:Sackler Lecture Theatre\, IoA
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