Effects of electron-positron pair opacity for spherical accretion onto black holes
1987; IOP Publishing; Volume: 315; Linguagem: Inglês
10.1086/184871
ISSN1538-4357
AutoresAlan P. Lightman, A. A. Zdziarski, M. J. Rees,
Tópico(s)Cosmology and Gravitation Theories
Resumoview Abstract Citations (29) References (10) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Effects of Electron-Positron Pair Opacity for Spherical Accretion onto Black Holes Lightman, Alan P. ; Zdziarski, Andrzej A. ; Rees, Martin J. Abstract 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. Publication: The Astrophysical Journal Pub Date: April 1987 DOI: 10.1086/184871 Bibcode: 1987ApJ...315L.113L Keywords: 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; Astrophysics; GALAXIES: NUCLEI; RADIATION MECHANISMS; ATOMIC PROCESSES; STARS: ACCRETION; BLACK HOLES full text sources ADS |
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