Andrea Biviano
Osservatorio Astronomico di Trieste (Trieste, Italie)
Salle des séminaires Évry Schatzman, Institut d'Astrophysique de Paris
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| « The orbits of galaxies in clusters » |
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Andrea Biviano |
| The orbital characteristics of the various types of galaxies in present-day clusters are related to the evolution of the clusters themselves, and of their member galaxies. In this seminar, after an introduction to the subject, and a review of previous results, a description is given of very recent results based on the analysis of the projected phase-space distributions of about 3000 galaxies in 57 nearby rich galaxy clusters. Solutions of the inverse Jeans equation are derived for these distributions, yielding the velocity anisotropies of four different populations of cluster galaxies (1. very bright ellipticals, 2. ellipticals and S0s, 3. early-type spirals, 4. late-type spirals and irregulars). The resulting orbital characteristics of these four populations of cluster galaxies are discussed in relation to scenarios for their evolution. |
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vendredi 12 novembre 2004 - 11:00 Salle des séminaires Évry Schatzman, Institut d'Astrophysique de Paris |
| Page web du séminaire / Seminar's webpage |