Computer Science
Scientific paper
Feb 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004sgyu.conf..117b&link_type=abstract
Studies of Galaxies in the Young Universe with New Generation Telescope, Proceedings of Japan-German Seminar, held in Sendai, Ja
Computer Science
Scientific paper
In the last few years it became more and more clear that standard accretion disk models are not suitable for the central regions of galaxies, in particular not for AGN, as soon as the disk mass is no longer negligible as compared to the mass of the central black hole. We have developed new and better suited models for such disks and will present the results of the stationary models. The most important effects come from using a generalized Reynolds-critical prescription for the viscosity in the disks. The new disk models accrete material much faster than standard disks. This may give an improved understanding of the very efficient "feeding" of massive black holes in young AGN. Furthermore we will address the question of disk instabilities caused by strong opacity variations. Such instabilities easily may be responsible for strong temporal modulations of the gas infall.
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