Ion viscosity-driven accretion in the absence of magnetic fields.

Details Ion viscosity-driven accretion in the absence of magnetic fields. Ion viscosity-driven accretion in the absence of magnetic fields.

Feb 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995a%26a...294..295m&link_type=abstract

Astronomy and Astrophysics 294, 295-302 (1995)

Astronomy and Astrophysics

Astrophysics

2

Accretion Disks, Hydrodynamics, Stars: Cyg X-1, X-Rays: Stars

Scientific paper

Taking angular momentum conservation into account, we discuss the conditions under which collisions between photons mediated by strong interactions can generate enough viscosity to drive accretion onto black holes in the absence of magnetic fields. We analyze these conditions for unsaturated inverse comptonization and bremsstrahlung. For bremsstrahlung the region where ion viscosity is operative is a small annulus about the size of the inner radius. Temperature there hardly exceeds temperature to ignite strong interactions. For accretion rates below a critical value there are two branches for the inverse comptonization. In the lower branch the temperature has a behavior similar to the bremsstrahlung case. In the upper branch temperature exceeds virial temperature for parameters appropriate to Cygnus X-1. These high values of the ion temperature are analyzed in terms of absence of advective cooling, non validity of the Keplerian law and low efficiency of angular momentum transport. It is shown that allowance for radial pressure gradients introduces qualitative differences in the flow, i.e., strong advective cooling, deviation from the Keplerian law and realization of transonic flows. No steady solution exists for accretion driven by ion viscosity if cooling due to pair production is taken into account.

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