Astronomy and Astrophysics – Astrophysics
Scientific paper
Jun 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002assl..272..197g&link_type=abstract
Merging Processes in Galaxy Clusters. Edited by L. Feretti, I.M. Gioia, G. Giovannini. Astrophysics and Space Science Library, V
Astronomy and Astrophysics
Astrophysics
32
Scientific paper
The historical course in the search of extended halo and relic sources in clusters of galaxies is summarized, and it is shown that only in recent years has a significant improvement in the knowledge of the properties of these sources been reached. The study of diffuse sources is very important in understanding the role of large scale magnetic fields and relativistic particles in the intracluster medium and for testing the physical conditions in clusters of galaxies. The properties of halos and relics are presented, and the connection between radio emission and cluster X-ray emission is emphasized. The evidence is presented that the formation of extended diffuse sources is related to the cluster mass and to the existence of strong merger events. Moreover, current models on the formation of the magnetic fields and of the population of relativistic electrons which give rise to the halo and relic radio emission are briefly illustrated.
Feretti Luigina
Giovannini Gabriele
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