Star Formation in Accretion Disks Around Massive Black Holes and Pregalactic Enrichment |
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| Authors: | Suzy Collin Jean-Paul Zahn |
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| Institution: | (1) Observatoire de Paris, Section de Meudon, DAEC, 1 Place Janssen, F92195 Meudon, France;(2) Observatoire de Paris, Section de Meudon, DASGAL, 1 Place Janssen, F92195 Meudon, France |
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| Abstract: | Broad Absorption Lines (BALs) prove the existence of a high velocity outflowing gas with metallicities larger than solar in
the central few parsecs of high redshift quasars. At the same distance from the black hole, accretion disks in quasars and
Active Galactic Nuclei (AGN) are locally gravitationally unstable, and clumps must form with a size of the order of the scale
height of the disk. This is hardly a coincidence, and we have tried to link these two facts. We have assumed that the unstable
clumps give rise to protostars, which become massive stars after a rapid stage of accretion, and explode as supernovae, producing
strong outflows perpendicular to the disk and inducing outward transfer of angular momentum in the plane of the disk. As a
consequence a self-regulated disk made of gas and stars where supernovae sustain the inflow mass rate required by the AGN
is a viable solution in this region of the disk. This model could explain the BALs, and could also account for a pregalactic
enrichment of the intergalactic medium and of the Galaxy, if massive black holes formed early in the Universe.
This revised version was published online in July 2006 with corrections to the Cover Date. |
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