THE FIFTH DATA RELEASE SLOAN DIGITAL SKY SURVEY/XMM-NEWTON QUASAR SURVEY
We present a catalog of 792 Fifth Data Release Sloan Digital Sky Survey quasars with optical spectra that have been observed serendipitously in the X-rays with the 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 {>=}2{sigma} account for 87% of the sample (685 quasars), and 473 quasars are detected at {>=}6{sigma}, sufficient to allow X-ray spectral fits. For detected sources, {approx}60% have X-ray fluxes between F {sub 2-10keV} = (1-10) x10{sup -14} erg cm{sup -2} s{sup -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 signal-to-noise ratio {>=} 6, resulting in a weighted mean photon index {gamma} = 1.91 {+-} 0.08, with an intrinsic dispersion {sigma}{sub {gamma}} = 0.38. For the 55 sources (11.6%) that prefer intrinsic absorption, we find a weighted mean N{sub H} = 1.5 {+-} 0.3 x 10{sup 21} cm{sup -2}. We find that {gamma} correlates significantly with optical color, {delta}(g - i), the optical-to-X-ray spectral index ({alpha}{sub ox}), and the X-ray luminosity. While the first two correlations can be explained as artifacts of undetected intrinsic absorption, the correlation between {gamma} and X-ray luminosity appears to be a real physical correlation, indicating a pivot in the X-ray slope.
- OSTI ID:
- 21269146
- Journal Information:
- Astrophysical Journal, Supplement Series, Vol. 183, Issue 1; Other Information: DOI: 10.1088/0067-0049/183/1/17; Country of input: International Atomic Energy Agency (IAEA); ISSN 0067-0049
- Country of Publication:
- United States
- Language:
- English
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