Abstract
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.
| Originalsprog | Engelsk |
|---|---|
| Tidsskrift | Bulletin of the American Astronomical Society |
| Vol/bind | 211 |
| Sider (fra-til) | 947- |
| ISSN | 0002-7537 |
| Status | Udgivet - 1 dec. 2007 |
| Udgivet eksternt | Ja |