The X-ray Continuum Slope of Quasars

Details The X-ray Continuum Slope of Quasars The X-ray Continuum Slope of Quasars

Jul 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aipc.1248..509s&link_type=abstract

X-RAY ASTRONOMY 2009; PRESENT STATUS, MULTI-WAVELENGTH APPROACH AND FUTURE PERSPECTIVES: Proceedings of the International Confer

Computer Science

Databases

X-Ray Spectra, Quasars, Sky Surveys, Redshift, X-Ray, Quasars, Astronomical Catalogs, Atlases, Sky Surveys, Databases, Retrieval Systems, Archives, Etc., Distances, Redshifts, Radial Velocities, Spatial Distribution Of Galaxies

Scientific paper

We present the X-ray properties of a large, optically selected sample of quasars from a cross-correlation of the SDSS DR5 quasar catalogue and the X-ray serendipitous source catalogue 2XMMi. We consider the dependence of photon index on X-ray luminosity and redshift. We find evidence for a correlation of photon index and redshift (decreasing photon indices for higher red-shift sources) and propose that this may be due to a Compton reflection component being redshifted into the XMM-Newton observed energy band. We show that this apparent trend can be removed when the spectra are analysed over a reduced range that would exclude any contribution from such a reflection component.

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