Optically thick accretion onto black holes

Details Optically thick accretion onto black holes Optically thick accretion onto black holes

Feb 1975

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975ap%26ss..32..403t&link_type=abstract

Astrophysics and Space Science, vol. 32, Feb. 1975, p. 403-421.

Astronomy and Astrophysics

Astronomy

48

Astronomical Models, Black Holes (Astronomy), Hydrogen Plasma, Magnetohydrodynamic Flow, Optical Thickness, Cosmic Plasma, Flow Equations, Gravitational Effects, Steady Flow, Stellar Evolution

Scientific paper

Spherically symmetric, steady-state, optically thick accretion of fully ionized hydrogen plasma onto a nonrotating black hole with a mass equal to that of the sun is studied. Accretion in the region well beyond the radius of the black hole is calculated nonrelativistically, using terms for free-free energy absorption, free-free and bound-free energy loss, and a new approximation for the Eddington factor. Relativistic equations are used to determine accretion within the black hole radius. The luminosity is estimated at 1.875 times 10 to the 33rd erg/sec, and the optically thick model is shown not to be a powerful source of X-rays. The spectrum of this model is compared with that of an optically thin model (considered to be an emitter of X-rays primarily due to bremsstrahlung radiation), and accretion onto a supermassive black hole is considered.

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