ON THE DISAPPEARANCE OF THE BROAD-LINE REGION IN LOW-LUMINOSITY ACTIVE GALACTIC NUCLEI

被引：146

作者：

Elitzur, Moshe ^{[1
]}

Ho, Luis C. ^{[2
]}

机构：

[1] Univ Kentucky, Dept Phys & Astron, Lexington, KY 40506 USA

[2] Observ Carnegie Inst Washington, Pasadena, CA 91101 USA

来源：

ASTROPHYSICAL JOURNAL LETTERS | 2009年 / 701卷 / 02期

基金：

美国国家科学基金会;

关键词：

accretion; accretion disks; galaxies: active; galaxies: Seyfert; quasars: general; DWARF SEYFERT NUCLEI; NEARBY GALAXIES; ACCRETION; EMISSION; SEARCH; TORUS; DUST; MASS; DISK;

D O I：

10.1088/0004-637X/701/2/L91

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

The disk-wind scenario for the broad-line region (BLR) and toroidal obscuration in active galactic nuclei (AGNs) predicts the disappearance of the BLR at low luminosities. In accordance with the model predictions, data from a nearly complete sample of nearby AGNs show that the BLR disappears at luminosities lower than 5 x 10(39) (M/10(7) M-circle dot)(2/3) erg s(-1), where M is the black hole mass. The radiative efficiency of accretion onto the black hole is less than or similar to 10(-3) for these sources, indicating that their accretion is advection-dominated.

引用

页码：L91 / L94

页数：4

共 30 条

[1]

ALMEDIA CR, 2009, APJ IN PRESS

[2] UNIFIED MODELS FOR ACTIVE GALACTIC NUCLEI AND QUASARS [J].