Other
Scientific paper
Mar 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008head...10.2604y&link_type=abstract
American Astronomical Society, HEAD meeting #10, #26.04
Other
Scientific paper
We have cross-correlated the DR5 Sloan Digital Sky Survey (SDSS) quasar selection with the XMM-Newton archive to obtain one of the largest known samples of quasars with both optical and X-ray observations (845 quasars). Of these, 64% (540 quasars) have high enough signal-to-noise to extract X-ray spectral information. We present the preliminary results as we apply this survey to the well-studied anti-correlation between the optical-to-X-ray spectral index (αox) and the optical luminosity (luv) found in AGN. This relation has been discussed for over 40 years but a physical cause has yet to be determined, largely because of the complexity of disk-corona models. Many past studies have utilized the 2500 /Angstrom and 2 keV fluxes to calculate αox, but this choice is historical, and is somewhat arbitrary from a scientific point of view. With a large sample of optical and X-ray spectra, we can investigate how the choice of other wavelengths influences the significance of the αox-luv relation. The wavelengths at which the relation is the tightest may give us clues as to the underlying physical processes. This work is funded by NASA grants NNX07AI22G and G06-7102X.
Elvis Martin
Risaliti Guido
Young Monica
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