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New Evidence for Accretion Disks in AGNs

Published online by Cambridge University Press:  07 August 2017

Jules P. Halpern  and
Kaiyou Chen
Jules P. Halpern
Affiliation:
Columbia Astrophysics Laboratory, Columbia University, 538 W. 120th Street, New York, New York 10027
Kaiyou Chen
Affiliation:
Columbia Astrophysics Laboratory, Columbia University, 538 W. 120th Street, New York, New York 10027

Abstract

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We have refined our calculation of the line profile of a relativistic, Keplerian disk by incorporating a variety of emissivity laws, as well as broadening due to turbulence or electron scattering. The significant improvement in the fit to the double-peaked Ha line profile of the elliptical radio galaxy Arp 102B provides the most convincing direct evidence for an accretion disk in any AGN. Arp 102B appears to be a low-luminosity analog of 3C 390.3, and several lines of evidence point to the existence of small, hot ion tori illuminating an outer thin disk in both of these galaxies. The rarity of these emission-line profiles might be understood if this particular combination of ion torus/thin disk occurs only for a narrow range of ṁ(= Ṁ/ṀEdd).

Type
Part 4: Black Holes, Accretion Disks and Gravitational Lenses
Information
Symposium - International Astronomical Union , Volume 134: Active Galactic Nuclei , 1989 , pp. 245 - 250
Copyright
Copyright © Kluwer 1989 

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