Standing Rankine Hugoniot Shocks in Black Hole Accretion Discs

Details Standing Rankine Hugoniot Shocks in Black Hole Accretion Discs Standing Rankine Hugoniot Shocks in Black Hole Accretion Discs

Dec 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004chphl..21.2551g&link_type=abstract

Chinese Physics Letters, Volume 21, Issue 12, pp. 2551-2554 (2004).

Physics

13

Scientific paper

We study the problem of standing shocks in viscous disc-like accretion flows around black holes. For the first time we parametrize such a flow with two physical constants, namely the specific angular momentum accreted by the black hole j and the energy quantity K. By providing the global dependence of shock formation in the j-K parameter space, we show that a significant parameter region can ensure solutions with Rankine Hugoniot shocks; and that the possibilities of shock formation are the largest for inviscid flows, decreasing with increasing viscosity, and ceasing to exist for a strong enough viscosity. Our results support the view that the standing shock is an essential ingredient in black hole accretion discs and is a general phenomenon in astrophysics, and that there should be a continuous change from the properties of inviscid flows to those of viscous ones.

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