Computer Science
Scientific paper
Apr 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007iaus..238..301o&link_type=abstract
Black Holes from Stars to Galaxies -- Across the Range of Masses. Edited by V. Karas and G. Matt. Proceedings of IAU Symposium #
Computer Science
Scientific paper
We study the global structure of super-Eddington accretion flows around black holes by performing the two-dimensional radiation-hydrodynamic simulations. Super-Eddington accretion is one of the plausible mechanisms for formation of the Super-massive black holes in the early universe. It is also thought to exist in some quasars and NLS1s. Our numerical simulations show that the super-Eddington accretion flow is composed of two parts: the radiation pressure-supported disk and the radiation pressure-driven outflow above the disk. It is found that the mass-accretion rate onto the BH considerably exceeds the critical value. It implies that the black hole can rapidly grow. Its timescale is about 106 yr. Apparent luminosity is much larger than the Eddington luminosity. Thus, the large luminosity in ULXs can be explained without IMBHs. In addition, we study the limit-cycle oscillations, which are induced by the disk instability. Our simulations succeed in reproducing the recurrent outbursts in microquasar, GRS 1915+105.
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