Astronomy and Astrophysics – Astrophysics
Scientific paper
2007-12-13
Astronomy and Astrophysics
Astrophysics
Proceedings of the workshop "Simbol-X: The Hard X-ray Universe in Focus", to appear in Memories of SAIt, (6 pages and 3 figure
Scientific paper
The most spectacular aspect of cluster radio emission is represented by the large-scale diffuse radio sources, which cannot be obviously associated with any individual galaxy. These sources demonstrate the existence of relativistic particles and magnetic fields in the cluster volume, thus indicating the presence of non-thermal processes in the hot intracluster medium. The knowledge of the properties of these sources has increased significantly in recent years, owing to sensitive radio images and to the development of theoretical models. An important piece of information on the origin and evolution of these sources can be obtained by the cluster X-ray emission of thermal origin, and by its relation to the radio emission. Moreover, non-thermal X-ray emission of inverse Compton origin gives direct information on the energy density of radio emitting particles and the intensity of magnetic field.
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