The anticorrelation between the hard X-ray photon index and the Eddington ratio in low-luminosity active galactic nuclei

被引：107

作者：

Gu, Minfeng ^{[1
]}

Cao, Xinwu ^{[1
]}

机构：

[1] Chinese Acad Sci, Shanghai Astron Observ, Key Lab Res Galaxies & Cosmol, Shanghai 200030, Peoples R China

来源：

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | 2009年 / 399卷 / 01期

基金：

美国国家科学基金会;

关键词：

accretion; accretion discs; galaxies: active; galaxies: nuclei; X-rays: galaxies; ADVECTION-DOMINATED ACCRETION; BLACK-HOLE MASS; SPECTRAL ENERGY-DISTRIBUTIONS; DWARF SEYFERT NUCLEI; EMISSION-LINE; XMM-NEWTON; CENTRAL ENGINES; STAR-FORMATION; GALAXIES; CHANDRA;

D O I：

10.1111/j.1365-2966.2009.15277.x

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We find a significant anticorrelation between the hard X-ray photon index Gamma and the Eddington ratio L-bol/L-Edd for a sample of low-ionization nuclear emission-line regions and local Seyfert galaxies, compiled from literature with Chandra or XMM-Newton observations. This result is in contrast with the positive correlation found in luminous active galactic nuclei (AGN), while it is similar to that of X-ray binaries (XRBs) in the low/hard state. Our result is qualitatively consistent with the spectra produced from advection-dominated accretion flows (ADAFs). It implies that the X-ray emission of low-luminosity active galactic nuclei (LLAGN) may originate from the Comptonization process in ADAF, and the accretion process in LLAGN may be similar to that of XRBs in the low/hard state, which is different from that in luminous AGN.

引用

页码：349 / 356

页数：8

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