Astronomy and Astrophysics – Astrophysics
Scientific paper
2001-11-06
Astronomy and Astrophysics
Astrophysics
8 pages, 3 figures, contribution to the workshop proceedings "Tracing Cosmic Evolution with Galaxy Clusters" (Sesto 2001), ASP
Scientific paper
New X-ray observations with XMM-Newton show a lack of spectral evidence for large amounts of cooling and condensing gas in the centers of galaxy clusters believed to harbour strong cooling flows. Here, we explore these diagnostics of the temperature structure of cooling cores with XMM-spectroscopy. We further find no evidence of intrinsic absorption in the center of the cooling flows of M87 and the Perseus cluster. To explain these findings we consider the heating of the core regions of clusters by jets from a central AGN. We find that the power of the AGN jets as estimated by their interaction effects with the intracluster medium in several examples is more then sufficient to heat the cooling flows. We explore which requirements such a heating model has to fulfill and find a very promising scenario of self-regulated Bondi accretion of the central black hole. In summary it is argued that most observational evidence points towards much lower mass deposition rates than previously inferred for cooling flow clusters.
Boehringer Hans
Churazov Eugene
Ikebe Yasushi
Matsushita Kyoko
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