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IPM
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“School of Astronomy”

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Paper   IPM / Astronomy / 13762
School of Astronomy
  Title:   IGM heating in fossil galaxy groups
  Author(s): 
1.  H. Miraghaei
2.  H.G. Khosroshahi
3.  H.R. Klöckner
4.  T.J. Ponman
5.  N.N. Jetha
6.  S. Raychaudhury
  Status:   Published
  Journal: MNRAS
  Vol.:  444
  Year:  2014
  Pages:   651-666
  Supported by:  IPM
  Abstract:
We study intergalactic medium (IGM) heating in a sample of five fossil galaxy groups by using their radio properties at 610 MHz and 1.4 GHz. The power by radio jets introducing mechanical heating for the sampled objects is not sufficient enough to suppress the cooling flow. Therefore, we discussed shock-, vortex heating, and conduction as alternative heating processes. Further, the 1.4 GHz and 610 MHz radio luminosities of fossil groups are compared to a sample of normal galaxy groups of the same brightest group galaxies (BGGs), stellar mass, and total group stellar mass, quantified using the K-band luminosity. It appears that the fossil BGGs are under luminous at 1.4 GHz and 610 MHz for a given BGG stellar mass and luminosity, in comparison to a general population of the groups. In addition, we explore how the bolometric radio luminosity of fossil sample depends on clusters and groups characteristics. Using the HIghest X-ray FLUx Galaxy Cluster Sample (HIFLUGCS) as a control sample we found that the large-scale behaviours of fossil galaxy groups are consistent with their relaxed and virialized nature.

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