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“School of Astronomy”

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Paper   IPM / Astronomy / 11370
School of Astronomy
  Title:   AGN Heating in Fossil Galaxy Groups - AJoint Chandra and GMRT Study
  Author(s): 
1.  N. Jetha
2.  H. G. Khosroshahi
3.  Ch. Sengupta
4.  S. Raychaudhury
5.  H. Miraghaee
  Status:   In Proceedings
  Proceeding: Chandra's First Decade of Discivery, Proceeding of the Conference held 22-25 Sep. 2009 in Boston
  Year:  2009
  Editor:  Scott Wolk, Antonella Fruscione, and Douglas Swartz
  Supported by:  IPM
  Abstract:
We present a sample of fossil galaxy groups with pre-existing Chandra and/or XMM-Newton X-ray observations and new low frequency GMRT data. 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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