Letter to the Editor
Radio and X-ray detectability of buoyant radio plasma bubbles in clusters of galaxies
Max-Planck-Institut für Astrophysik, Karl-Schwarzschild-Str. 1, Postfach 1317, 85741 Garching, Germany
Corresponding author: T. A. Enßlin, firstname.lastname@example.org
Accepted: 5 February 2002
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.
Key words: radiation mechanisms: thermal / radiation mechanism: non-thermal / galaxies: active / intergalactic medium / galaxies: cluster: general / radio continuum: general
© ESO, 2002