The 0.5-10keV spectra of broad-line quasars and the X-ray background

被引：0

作者：

Pappa, A ^{[1
]}

Stewart, GC ^{[1
]}

Georgantopoulos, I ^{[1
]}

Griffiths, RE ^{[1
]}

Boyle, BJ ^{[1
]}

Shanks, T ^{[1
]}

Almaini, O ^{[1
]}

机构：

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

来源：

X-RAY ASTRONOMY: STELLAR ENDPOINTS, AGN, AND THE DIFFUSE X-RAY BACKGROUND | 2001年 / 599卷

关键词：

surveys; galaxies : active; galaxies : general; X-rays : galaxies; X-rays : general;

D O I：

暂无

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We present an analysis of the ROSAT and ASCA spectra of 21 broad line quasars detected in six ROSAT deep fields with the ASCA GIS.. The summed spectrum in the ASCA band is well described by a power-law with Gamma = 1.56 +/- 0.2, flatter that the average spectral index of bright quasars. The 0.5-8keV ASCA -ROSAT spectrum is well fit by a power-law of Gamma = 1.7 +/- 0.2 when a soft excess component is included. The analysis of the individual hardness ratios confirms the flattening of the spectral index towards fainter fluxes.

引用

页码：834 / 837

页数：2

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