The ultraviolet excess of luminous quasars. II - Evidence for massive accretion disks

Details The ultraviolet excess of luminous quasars. II - Evidence for massive accretion disks The ultraviolet excess of luminous quasars. II - Evidence for massive accretion disks

May 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983apj...268..582m&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 268, May 15, 1983, p. 582-590. Research supported by the Fannie and John He

Astronomy and Astrophysics

Astronomy

333

Accretion Disks, Astronomical Models, Quasars, Seyfert Galaxies, Ultraviolet Spectra, Angular Momentum, Black Holes (Astronomy), Infrared Spectra, Luminosity, Relativity, Spectrum Analysis

Scientific paper

This paper presents new infrared, optical, and ultraviolet spectra of three high-redshift quasars. They are analyzed along with three published quasar spectra. After accounting for other sources of radiation, the continua are fitted with spectra predicted for optically thick steady-state accretion disks which include the effects of general relativity. The two fitting parameters, the mass of the accreting black hole and the accretion rate, are determined by the data with a formal accuracy of 20 percent. The masses range from 0.2-0.5 billion solar mass for 3C 273 and PKS 0405-123 to 1-3 billion solar masses for the high-redshift quasars. The values depend on the assumed disk inclination and the angular momentum of the hole. The high luminosities of these six quasars are all within a factor of 2 of their Eddington limits, and this conclusion is not extremely sensitive to the modeling assumptions.

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