A Full Year's Chandra Exposure on SDSS Quasars from the Chandra Multiwavelength Project

Details A Full Year's Chandra Exposure on SDSS Quasars from the Chandra Multiwavelength Project A Full Year's Chandra Exposure on SDSS Quasars from the Chandra Multiwavelength Project

2008-09-05

arxiv.org/abs/0809.1058v1

Astrophys.J.690:644-669,2009

Astronomy and Astrophysics

Astrophysics

28 pages, 21 figures. Accepted (26 Aug 2008) for publication in ApJS. Electronic datafiles (for tables 2 and 3) and high resol

Scientific paper

10.1088/0004-637X/690/1/644

We study the spectral energy distributions and evolution of a large sample of optically selected quasars from the Sloan Digital Sky Survey (SDSS) that were observed in 323 Chandra images analyzed by the Chandra Multiwavelength Project (ChaMP). Our highest-confidence matched sample includes 1135 X-ray detected quasars in the redshift range 0.23 QSOs detected, we find no evidence for evolution out to z~5 for either the X-ray photon index Gamma or for the ratio of optical/UV to X-ray flux alpha_ox. About 10% of detected QSOs are obscured (Nh>1E22), but the fraction might reach ~1/3 if most non-detections are absorbed. We confirm a significant correlation between alpha_ox and optical luminosity, but it flattens or disappears for fainter AGN alone. Gamma hardens significantly both towards higher X-ray luminosity, and for relatively X-ray loud quasars. These trends may represent a relative increase in non-thermal X-ray emission, and our findings thereby strengthen analogies between Galactic black hole binaries and AGN.

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