The correlation between the X-ray spectral slope and the FeKα line energy in radio-quiet active galactic nuclei

被引：12

作者：

Dewangan, GC ^{[1
]}

机构：

[1] Tata Inst Fundamental Res, Dept Astron & Astrophys, Colaba 400005, Mumbai, India

来源：

ASTROPHYSICAL JOURNAL | 2002年 / 581卷 / 02期

关键词：

accretion; accretion disks; galaxies : active; X-rays : galaxies;

D O I：

10.1086/346032

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

A significant correlation between the Fe Kalpha line energy and the X-ray spectral slope has been discovered among radio-quiet active galactic nuclei. The ionization stage of the bulk of the Fe Kalpha-emitting material is not the same in all active galactic nuclei and is related to the shape of the X-ray continua. Active galactic nuclei with a steep X-ray spectrum tend to have a fluorescence Fe Kalpha line from highly ionized material. In the narrow-line Seyfert 1 galaxies with a steeper X-ray spectrum (Gamma(x) greater than or similar to 2.1), the Fe Kalpha line originates from highly ionized material. In the Seyfert 1 galaxies and quasars with a flatter X-ray spectrum (Gamma(x) less than or similar to 2.1 ), the bulk of the Fe Kalpha emission arises from near-neutral or weakly ionized material. The correlation is an important observational characteristic related to the accretion process in radio-quiet active galactic nuclei and is driven by a fundamental physical parameter that is likely to be the accretion rate relative to the Eddington rate.

引用

页码：L71 / L75

页数：5

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