Observational Insights Into the Dependence of Quasar Accretion Disk Structure on Black Hole Mass and Accretion Rate
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Observational Insights Into the Dependence of Quasar Accretion Disk Structure on Black Hole Mass and Accretion Rate. / Kelly, Brandon C.; Bechtold, J.; Trump, J. R.; Vestergaard, M.; Siemiginowska, A.
I: Bulletin of the American Astronomical Society, Bind 211, 01.12.2007, s. 947-.Publikation: Bidrag til tidsskrift › Tidsskriftartikel › Forskning › fagfællebedømt
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TY - JOUR
T1 - Observational Insights Into the Dependence of Quasar Accretion Disk Structure on Black Hole Mass and Accretion Rate
AU - Kelly, Brandon C.
AU - Bechtold, J.
AU - Trump, J. R.
AU - Vestergaard, M.
AU - Siemiginowska, A.
PY - 2007/12/1
Y1 - 2007/12/1
N2 - 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.
AB - 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.
M3 - Journal article
VL - 211
SP - 947-
JO - American Astronomical Society. Bulletin
JF - American Astronomical Society. Bulletin
SN - 0002-7537
ER -
ID: 229915740