The X-ray Continuum Slope of Quasars

被引：0

作者：

Scott, A. ^{[1
]}

Stewart, G. ^{[1
]}

Mateos, S. ^{[1
]}

Alexander, D. ^{[2
]}

Hutton, S. ^{[2
]}

机构：

[1] Univ Leicester, Dept Phys & Astron, Leicester LE1 7RH, Leics, England

[2] Univ Durham, Dept Phys, Durham DH1 3LE, England

来源：

X-RAY ASTRONOMY-2009: PRESENT STATUS, MULTI-WAVELENGTH APPROACH AND FUTURE PERSPECTIVES, PROCEEDINGS | 2010年 / 1248卷

关键词：

X-rays:spectra; galaxies:active; 5TH DATA RELEASE;

D O I：

10.1063/1.3475324

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

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 redshift 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.

引用

页码：509 / +

页数：2

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