Luigina Feretti
Osservatorio Astrofisico di Catania (Catane, italie)
Salle des séminaires Évry Schatzman, Institut d'Astrophysique de Paris
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| « Properties and radio spectra of cluster radio halos » |
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Luigina Feretti |
| Radio halos in cluster of galaxies are detected only in massive clusters showing recent merger processes. I will present evidence of the connection between radio halos and cluster mergers. In particular, the radio spectral index distribution of the halos in A665 and A2163 indicate a flattening in the regions influenced by the merger. This favours the idea that the cluster merger is responsible for the energy supply to the radio halos. Models of electron reaccelerations are thus suggested to be most appropriate to describe the radio emission in halos. |
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vendredi 18 novembre 2005 - 11:00 Salle des séminaires Évry Schatzman, Institut d'Astrophysique de Paris |
| Page web du séminaire / Seminar's webpage |