Two-temperature accretion disks with electron-positron pairs

Details Two-temperature accretion disks with electron-positron pairs Two-temperature accretion disks with electron-positron pairs

Apr 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993cha%26a..17..126y&link_type=abstract

Chinese Astronomy and Astrophysics, Volume 17, Issue 2, p. 126-135.

Astronomy and Astrophysics

Astrophysics

Quasars-Accretion Disks-Bremsstrahlung

Scientific paper

We investigate two-temperature disks that contain electron-positron pairs generated by nonthermal cascading. We show the existence of a critical accretion rate both for bremsstrahlung and comptonized bremsstrahlung disks. Below the critical value, there is a unique stationary solution for the disk structure; above the critical value, there is none such. For the comptonized disk, we have derived the relations between critical accretion rate and the Shakura-Sunyaev viscosity parameter α and the energy-generation parameter ɛe. For the bremsstrahlung disk, the effect of electron pairs can be neglected; for the comptonized disk, the electron-pairs can have densities as high as 10-2 ~ 100, and exert much influence on the disk structure and spectrum.

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