Generalized Shock Solutions for Hydrodynamic Black Hole Accretion
arXiv:astro-ph/0212119 · doi:10.1086/342114
Abstract
For the first time, {\it all} available pseudo-Schwarzschild potentials are exhaustively used to investigate the possibility of shock formation in hydrodynamic, invicid, black hole accretion discs. It is shown that a significant region of parameter space spanned by important accretion parameters allows shock formation for flow in {\it all} potentials used in this work. This leads to the conclusion that the standing shocks are essential ingredients in accretion discs around non-rotating black holes in general. Using a complete general relativistic framework, equations governing multi-transonic black hole accretion and wind are also formulated and solved in the Schwarzschild metric. Shock solutions for accretion flow in various pseudo potentials are then compared with such general relativistic solutions to identify which potential is the best approximation of Schwarzschild space-time as far as the question of shock formation in black hole accretion discs is concerned.
34 pages. 7 black and white encapsulated post-script figures. Higher resolution Fig. 4 is available from http://www.astro.ucla.edu/~tapas/figure4.eps.gz Published in ApJ
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