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The X-ray continuum slope of quasars

Abstract: 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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Congress: International Conference on X-ray Astronomy : Present Status, Multi-Wavelength Approach and Future Perspectives (2009 : Bolonia)

Publisher: American Institute of Physics

Year of publication: 2010

No. of pages: 2

Publication type: Conference object

DOI: 10.1063/1.3475324

ISSN: 0094-243X,1551-7616

Publication Url: https://doi.org/10.1063/1.3475324

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Authorship

SCOTT, A.

STEWART, G.

SILVIA MATEOS IBAÑEZ

ALEXANDER, D.

HUTTON, S.

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