Hot accretion disks with electron-positron pairs

Details Hot accretion disks with electron-positron pairs Hot accretion disks with electron-positron pairs

May 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989apj...340.1024w&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 340, May 15, 1989, p. 1024-1037.

Astronomy and Astrophysics

Astrophysics

57

Accretion Disks, Bremsstrahlung, Compton Effect, Electron-Positron Pairs, Nuclear Astrophysics, Luminosity, Pair Production, X Ray Sources

Scientific paper

The hot thermal accretion disks of the 1970s are studied and consideration is given to the effects of electron-positron pairs, which were originally neglected. It is found that disks cooled by internally produced photons have a critical accretion rate above which equilibrium is not possible in a radial annulus centered around r = 10 GM/c-squared, where M is the mass of the central object. This confirms and extends previous work by Kusunose and Takahara. Above the critical rate, pairs are created more rapidly than they can be destroyed. Below the critical rate, there are two solutions to the disk structure, one with a high pair density and one with a low pair density. Depending on the strength of the viscosity, the critical accretion rate corresponds to a critical luminosity of about 3-10 percent of the Eddington limit.

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