Wolfgang J. Duschl
Institut für Theoretische Astrophysik, Ruprecht-Karls-Universität Heidelberg (Heidelberg, Allemagne)
Salle des séminaires Évry Schatzman, Institut d'Astrophysique de Paris
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| « The Cosmogony of Super-Massive Black Holes » |
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Wolfgang J. Duschl |
| Recent surveys, both in the optical and, in particular, in the X-ray regime, indicate that the most massive black holes (for instance in quasars) must have formed earlier and quicker than less massive ones. We show that the rapid formation of super-massive black holes in quasars can indeed be understood in terms of major galaxy mergers followed by disk accretion. Weaker galaxy interactions lead to less compact and less massive accretion disks which take considerably longer to grow a (consequently less massive) black hole. Due to the expansion of the cosmos, strong interactions become less likely with time and thus lead to the formation of fewer and fewer very massive black holes. |
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vendredi 28 octobre 2005 - 11:00 Salle des séminaires Évry Schatzman, Institut d'Astrophysique de Paris |
| Page web du séminaire / Seminar's webpage |