Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...21112503c&link_type=abstract
American Astronomical Society, AAS Meeting #211, #125.03; Bulletin of the American Astronomical Society, Vol. 39, p.955
Astronomy and Astrophysics
Astronomy
Scientific paper
Black hole outbursts in clusters release large amounts of energy which is believed to be dissipated in the intra-cluster medium (ICM). Before dissipation this energy is present in the gas in the form of cosmic rays, magnetic fields and micro-turbulence. We compare X-ray and optical data on the central few effective radii of gas rich elliptical galaxies. This comparison suggests that the energy density from cosmic rays, magnetic fields and micro-turbulence is at the level of 10% of the ICM thermal energy. These results provide strong support for a simple theoretical model of a supermassive black hole in a hot hydrostatic atmosphere working as a self-tuned source of energy, capable of preventing gas cooling in local clusters and perhaps quenching star formation in high redshift elliptical galaxies.
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