Observational Insights Into the Dependence of Quasar Accretion Disk Structure on Black Hole Mass and Accretion Rate

Details Observational Insights Into the Dependence of Quasar Accretion Disk Structure on Black Hole Mass and Accretion Rate Observational Insights Into the Dependence of Quasar Accretion Disk Structure on Black Hole Mass and Accretion Rate

Dec 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...21111804k&link_type=abstract

American Astronomical Society, AAS Meeting #211, #118.04; Bulletin of the American Astronomical Society, Vol. 39, p.947

Astronomy and Astrophysics

Astronomy

Scientific paper

I will discuss recent work on using the X-ray and optical properties of a sample of 318 radio-quiet quasars to investigate the dependence quasar accretion disk structure on black hole mass and accretion rate. Specifically, we studied the dependence of the ratio of quasar optical flux to X-ray flux on black hole mass and Eddington ratio, as well as the dependence of the X-ray spectral slope on black hole mass and Eddington ratio. We find evidence that quasars emit a smaller fraction of their bolometric luminosity in the X-rays as black hole mass and accretion rate increase. In addition, we find evidence that the X-ray spectral slope displays a non-monotonic dependence on black hole mass and accretion rate. I will discuss our results within the context of accretion models with comptonizing corona, and discuss the implications for quasar feedback.
This work was supported in part by NSF grant AST03-07384.

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