/ftp/cats/J_ApJS/176/./355



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J/ApJS/176/355         AGN X-Ray emission and black holes         (Kelly+, 2008)
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Beginning of ReadMe : J/ApJS/176/355 AGN X-Ray emission and black holes (Kelly+, 2008) ================================================================================ Observational constraints on the dependence of radio-quiet quasar X-ray emission on black hole mass and accretion rate. Kelly B.C., Bechtold J., Trump J.R., Vestergaard M., Siemiginowska A. <Astrophys. J. Suppl. Ser., 176, 355-373 (2008)> =2008ApJS..176..355K ================================================================================ ADC_Keywords: QSOs ; X-ray sources Keywords: accretion, accretion disks - galaxies: active - quasars: general ultraviolet: galaxies - X-rays: galaxies Abstract: In this work we use a sample of 318 radio-quiet quasars (RQQs) to investigate the dependence of the ratio of optical/UV flux to X-ray flux, alpha_ox_, and the X-ray photon index, Gamma_X_, on black hole mass, UV relative to Eddington luminosity, and X-ray relative to Eddington luminosity. Our sample is drawn from the literature, with X-ray data from ROSAT and Chandra, and optical data mostly from the SDSS; 153 of these sources have estimates of Gamma_X_ from Chandra. We estimate M_BH_ using standard estimates derived from the Hbeta, MgII, and CIV broad emission lines. To date, this is the largest study of the dependence of RQQ X-ray parameters on black hole mass and related quantities, and the first to attempt to correct for the large statistical uncertainty in the broad-line mass estimates. Description: In this analysis we combine 169 RQQs from Kelly et al. (2007ApJ...665.1489K) with 149 RQQs from the main SDSS sample of Strateva et al. (2005, Cat. J/AJ/130/387) to create a sample of 318 RQQs. Out of these 318 sources, 276 (86.8%) are detected in the X-ray.