The relationship between the X-ray and optical luminosities for QSOs

Details The relationship between the X-ray and optical luminosities for QSOs The relationship between the X-ray and optical luminosities for QSOs

Aug 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983apj...271..531t&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 271, Aug. 15, 1983, p. 531-535.

Astronomy and Astrophysics

Astronomy

15

Accretion Disks, Black Holes (Astronomy), Luminosity, Quasars, X Ray Astronomy, Astronomical Models

Scientific paper

A study of simple models for the optical and X-ray luminosities of QSOs shows that a thick accretion disk around a black hole is consistent with the observed dependence of the X-ray luminosity L(x) on the optical luminosity L(opt) to the bth power, with b roughly in the range 0.5-0.8. The disk is expected to be thick since the sources are accreting at rates near the Edington limit. Using the model of McMillan, Lightman, and Cohn (1981) for the gas supply rate, the evolution of L(opt) is predicted to be proportional to t/t(0) to the -8/3 and that of L(x) is predicted to be proportional to t/t(0) to the -2.

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