The Fifth Data Release Sloan Digital Sky Survey/XMM-Newton Quasar Survey
M. Young, M. Elvis, G. Risaliti

TL;DR
This paper presents a comprehensive catalog of 792 quasars observed in X-rays by XMM-Newton, analyzing their spectral properties, correlations with optical and X-ray luminosities, and intrinsic absorption characteristics.
Contribution
It provides the first large, multiwavelength catalog of SDSS quasars with X-ray spectral analysis and investigates correlations between spectral and luminosity properties.
Findings
87% of quasars detected at >2sigma in X-rays
Weighted mean photon index Gamma = 1.91 +/- 0.08
Significant correlation between Gamma and X-ray luminosity
Abstract
We present a catalog of 792 DR5 SDSS quasars with optical spectra that have been observed serendipitously in the X-rays with the \emph{XMM-Newton}. These quasars cover a redshift range of z = 0.11 - 5.41 and a magnitude range of i = 15.3-20.7. Substantial numbers of radio-loud (70) and broad absorption line (51) quasars exist within this sample. Significant X-ray detections at >2sigma account for 87% of the sample (685 quasars), and 473 quasars are detected at >6sigma, sufficient to allow X-ray spectral fits. For detected sources, ~ 60% have X-ray fluxes between F(2-10 keV) = 1 - 10 x 10^-14 ergs cm^-2 s^-1. We fit a single power-law, a fixed power-law with intrinsic absorption left free to vary, and an absorbed power-law model to all quasars with X-ray S/N > 6, resulting in a weighted mean photon index Gamma = 1.91 +/- 0.08, with an intrinsic dispersion sigma_Gamma = 0.38. For the 55…
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