Journal
ASTRONOMY & ASTROPHYSICS
Volume 384, Issue 3, Pages L27-L30Publisher
E D P SCIENCES
DOI: 10.1051/0004-6361:20020207
Keywords
radiation mechanisms : thermal; radiation mechanism : non-thermal; galaxies : active; intergalactic medium; galaxies : cluster : general; radio continuum : general
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The Chandra X-ray Observatory is finding a surprisingly large number of cavities in the X-ray emitting intracluster medium (ICM), produced by the release of radio plasma from active galactic nuclei. In this letter, we present simple analytic formulae for the evolution of the X-ray deficit and for the radio spectrum of a buoyantly rising bubble. The aim of this work is to provide a theoretical framework for the planning and the analysis of X-ray and radio observations of galaxy clusters. We show that the cluster volume tested for the presence of cavities by X-ray observations is a strongly rising function of the sensitivity.
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