Astronomy and Astrophysics – Astrophysics
Scientific paper
2004-11-15
Mon.Not.Roy.Astron.Soc. 357 (2005) 279-294
Astronomy and Astrophysics
Astrophysics
16 pages, 9 figures. Accepted for publication in MNRAS
Scientific paper
10.1111/j.1365-2966.2005.08665.x
We report evidence that the gas properties of X-ray groups containing radio galaxies differ from those of radio-quiet groups. For a well-studied sample of ROSAT-observed groups, we found that more than half of the elliptical-dominated groups can be considered ``radio-loud'', and that radio-loud groups are likely to be hotter at a given X-ray luminosity than radio-quiet groups. We tested three different models for the origin of the effect and conclude that radio-source heating is the most likely explanation. We found several examples of groups where there is strong evidence from Chandra or XMM-Newton images for interactions between the radio source and the group gas. A variety of radio-source heating processes are important, including shock-heating by young sources and gentler heating by larger sources. The heating effects can be longer-lasting than the radio emission. We show that the sample of X-ray groups used in our study is not significantly biased in the fraction of radio-loud groups that it contains. This allows us to conclude that the energy per particle that low-power radio galaxies can inject over the group lifetime is comparable to the requirements of structure formation models.
Birkinshaw Mark
Croston Judith H.
Hardcastle Martin J.
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