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“School of Astronomy”

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Paper   IPM / Astronomy / 11369
School of Astronomy
  Title:   Fossil Galaxy Groups - Ideal Laboratories for Studing the Effects of AGN Heating
  Author(s): 
1.  N. N. Jetha
2.  H. G. Khosroshahi
3.  S. Raychaudhury
4.  Ch. Sengupta
5.  M. Hardcastle
  Status:   In Proceedings
  Proceeding: The Monster's Fiery Breath,Madison, Wisconsin, 1-5 June
  Vol.:  1201
  Year:  2009
  Pages:   305-308
  Editor:  Ed. Sebastian Heinz & Eric Wilcots
  Supported by:            ipm IPM
  Abstract:
We present the first of a sample of fossil galaxy groups with pre-existing Chandra and/or XMM-Newton X-ray observations and new or forthcoming low frequency GMRT data - RXJ1416.4+2315 (z=0.137). Fossil galaxy groups are ideal laboratories for studying feedback mechanisms and how energy injection affects the IGM, since due to the lack of recent merging activity, we expect the IGM to be relatively pristine and affected only by any AGN activity that has occurred in the group. Our Chandra X-ray observations reveal features resembling AGN-inflated bubbles, whilst our GMRT radio data show evidence of extended emission from the central AGN that may be filling the bubble. This has enabled us to estimate the work done by the central AGN, place limits on the rates of energy injection and discuss the nature of the plasma filling the bubble.

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