A New Look at Optical and X-ray Emission in SDSS/XMM-Newton Quasars

Details A New Look at Optical and X-ray Emission in SDSS/XMM-Newton Quasars A New Look at Optical and X-ray Emission in SDSS/XMM-Newton Quasars

Nov 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010hia....15..263y&link_type=abstract

Highlights of Astronomy, Volume 15, p. 263-265

Astronomy and Astrophysics

Astronomy

Quasars: General, Galaxies: Active, Accretion, Accretion Disks

Scientific paper

We develop a new approach to the well-studied anti-correlation between the optical-to-X-ray spectral index, αox, and the monochromatic optical luminosity, lopt. By cross-correlating the SDSS DR5 quasar catalog with the XMM-Newton archive, we create a sample of 327 quasars with both optical and X-ray spectra, allowing αox to be defined at arbitrary frequencies, rather than the standard 2500 Å and 2 keV. We find that while the choice of optical wavelength does not strongly influence the αox-lopt relation, the slope of the relation flattens significantly with X-ray energy. This result suggests a change in the efficiency of X-ray photon production, where the efficiency of low energy X-ray production depends more strongly on the seed (optical/UV) photon supply. We discuss implications for line-driven wind models.

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