Time--dependent analysis of spherical accretion onto black holes

Details Time--dependent analysis of spherical accretion onto black holes Time--dependent analysis of spherical accretion onto black holes

1996-07-04

arxiv.org/abs/astro-ph/9607030v2

Astronomy and Astrophysics

Astrophysics

14 pages, Plain TeX, 6 postscript figures, replaced version does not include the Blackwell Scientific Publications TeX Macros,

Scientific paper

Results are presented from a time--dependent, numerical investigation of spherical accretion onto black holes, within the framework of relativistic radiation hydrodynamics. We have studied the stability of self--consistent, stationary solutions of black hole accretion with respect to thermal and radiative perturbations and also the non--linear evolution of unstable, high temperature models, heated by the hard radiation produced by the accretion flow itself in the inner region near to the horizon. In some cases, a hydrodynamic shock forms at around $10^3$--$10^4$ Schwarzschild radii, where Compton heating exceeds radiative cooling. The calculations were made using a suitably designed radiation hydrodynamics code, in which radiative transfer is handled by means of the PSTF moment formalism and which contains an original treatment of the radiation temperature equation.

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