The effect of anisotropic emission from thick accretion disks on the luminosity functions of active galactic nuclei

Details The effect of anisotropic emission from thick accretion disks on the luminosity functions of active galactic nuclei The effect of anisotropic emission from thick accretion disks on the luminosity functions of active galactic nuclei

Apr 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991apj...371..510u&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 371, April 20, 1991, p. 510-514. Research supported by Ministero dell'Unive

Astronomy and Astrophysics

Astronomy

8

Accretion Disks, Active Galactic Nuclei, Black Holes (Astronomy), Galactic Radiation, Seyfert Galaxies, Anisotropy, Brightness Distribution, Radiation Distribution, Stellar Mass Accretion

Scientific paper

High-luminosity active galactic nuclei (AGNs) powered by accretion onto a massive black hole (or other compact object) may have bolometric luminosities dominated by thermal emission from a geometrically thick accretion disk. Radiation from these disks is strongly anisotropic, which has important consequences for the observed luminosity distribution, and therefore for systematic biases in flux-limited samples. The effect of anisotropic emission from an ensemble of AGNs with random oriented thick disks radiating at or near the Eddington limit is calculated. Because of their higher luminosities, it is predicted face-on disks should constitute an increasing fraction of observed high-redshift, high-luminosity AGNs. Comparison of the results with observed quasar luminosity functions suggests a narrow mass distribution with an upper limit of about a billion solar masses for high-redshift quasars.

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