Statistics – Computation
Scientific paper
Apr 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987apj...315l.113l&link_type=abstract
Astrophysical Journal, Part 2 - Letters to the Editor (ISSN 0004-637X), vol. 315, April 15, 1987, p. L113-L118.
Statistics
Computation
20
Black Holes (Astronomy), Deposition, Electron-Positron Pairs, Galactic Nuclei, Opacity, Pair Production, Computational Astrophysics, Eddington Approximation, Energy Conversion, Gravitational Waves, Scattering Cross Sections, Stellar Magnetic Fields
Scientific paper
The paper considers e(+)e(-) pair production by nonthermal processes in spherically symmetric accretion onto a black hole and solves for local pair densities by balancing pair production against pair annihilation and spatial inflow. Assuming that the pairs are coupled to the ions, it is found that the increased opacity due to pairs can substantially increase the radius within which radiation is trapped by the infalling matter and carried into the hole and can substantially decrease the effective Eddington limit. The principal new results are that: (1) the escaping luminosity L varies with the mass accretion rate M according to L varies inversely as M exp 2/3 for an intermediate range of M; and (2) the luminosity can reach about one-half of the pair-reduced Eddington limit while only about 1/20 of the classical Eddington limit.
Lightman Alan P.
Rees Martin J.
Zdziarski Andrzej A.
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