Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987apj...313..689b&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 313, Feb. 15, 1987, p. 689-698. Research supported by Ball Corp., Rockwell
Astronomy and Astrophysics
Astronomy
25
Black Holes (Astronomy), Electron-Positron Pairs, Pair Production, Plasma Cooling, Stellar Mass Accretion, Active Galactic Nuclei, Cosmic Plasma, Dynamic Characteristics, Electrons, Gravitational Collapse, Positrons, Quasars, Synchrotron Radiation
Scientific paper
The two-temperature criterion for quasi-spherical (ion-pressure supported) accretion onto a black hole, including the effects of electron-positron pair production is studied. For an interesting range of accretion rates, Coulomb interactions between protons and pairs can cool the innermost regions of the accretion flow. The cooled plasma, assumed to possess some angular momentum, will collapse onto the equatorial plane, forming an optically thick annulus. Hysteresis effects involved in the cooling criterion are expected to lead to bistability or time dependence, which may be associated with variability in certain classes of active galactic nuclei (AGNs). Radiation from the annulus may be responsible for the EUV/soft X-ray excess observed in some AGNs.
Begelman Mitchell C.
Rees Martin J.
Sikora Marek
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