Non-thermal Pressure in Galaxy Cluster Cores

Astronomy and Astrophysics – Astronomy

Scientific paper

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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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