Other
Scientific paper
Jan 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21344709w&link_type=abstract
American Astronomical Society, AAS Meeting #213, #447.09; Bulletin of the American Astronomical Society, Vol. 41, p.334
Other
Scientific paper
We have compiled the largest current sample of 4000 optically selected quasars (QSOs) which have also been observed in X-rays with ROSAT, Chandra, and/or XMM-Newton. The first 1000 sources are drawn from a diverse set of QSO surveys, including the SDSS, 2QZ, 6QZ, and Hamburg surveys, with a magnitude limit of $i \la 17$. The other 3000 quasars are selected from the SDSS DR5 spectroscopic quasar catalog and DR6 photometric catalog without a magnitude limit, which significantly increases the densely sampled coverage of the luminosity-redshift plane. We characterize the relation between UV and X-ray luminosity in detail, test for additional physical factors that influence this relation, and constrain the relative variation between UV and X-rays. These results have important consequences for our understanding of the uniformity and structure of QSO accretion processes. We gratefully acknowledge the support of NASA LTSA grant NAG5-13035.
Brandt Wiliam N.
Gibson Robert R.
Wu Jianfeng
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