Accretion of low angular momentum material on compact objects. I. Hydrodynamical inviscid case.

Details Accretion of low angular momentum material on compact objects. I. Hydrodynamical inviscid case. Accretion of low angular momentum material on compact objects. I. Hydrodynamical inviscid case.

Apr 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002aps..aprx11005p&link_type=abstract

American Physical Society, April Meeting, Jointly Sponsored with the High Energy Astrophysics Division (HEAD) of the American As

Astronomy and Astrophysics

Astrophysics

Scientific paper

We study the two-dimensional, time-dependent hydrodynamics of accretion flows onto compact objects. For an initial state, we assume a standard, spherically symmetric Bondi flow with the exception that the flow has small specific angular momentum at infinite radius. We calculate time evolution of the flow for various values and distributions of the angular momentum. Our goal is to understand what determines the morphology of the flow and the mass accretion rate in a simplified inviscid case so that we can better understand more complex viscid flows. We find basically only two solutions to the flow: 1) the Bondi solution for the angular momentum lower than a critical value and 2) the solution with a fat non-accreting disk and an accreting funnel along the rotational axis. The critical specific angular momentum is defined by the angular momentum needed for the corresponding centrifugal force to balance the gravity at the surface of accreting object. It is surprising that the second solution is insensitive to how much angular momentum at infinity exceeds the critical value. In particular, the mass accretion rate, the density, and shape of the disk do not change with angular momentum above the critical value. Additionally, the angular momentum distribution in the disk is always uniform and it just above the critical value even in the cases where the angular momentum at infinity is assumed to be orders of magnitude higher at the equator and decrease toward the poles.

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