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THE EVOLUTION AND EDDINGTON RATIO DISTRIBUTION OF COMPTON THICK ACTIVE GALACTIC NUCLEI
被引:44
作者:

Draper, A. R.
论文数: 0 引用数: 0
h-index: 0
机构:
Georgia Inst Technol, Ctr Relativist Astrophys, Sch Phys, Atlanta, GA 30332 USA Georgia Inst Technol, Ctr Relativist Astrophys, Sch Phys, Atlanta, GA 30332 USA

Ballantyne, D. R.
论文数: 0 引用数: 0
h-index: 0
机构:
Georgia Inst Technol, Ctr Relativist Astrophys, Sch Phys, Atlanta, GA 30332 USA Georgia Inst Technol, Ctr Relativist Astrophys, Sch Phys, Atlanta, GA 30332 USA
机构:
[1] Georgia Inst Technol, Ctr Relativist Astrophys, Sch Phys, Atlanta, GA 30332 USA
关键词:
galaxies: active;
quasars: general;
X-rays: diffuse background;
SUPERMASSIVE BLACK-HOLES;
SPITZER MIDINFRARED SPECTROSCOPY;
RAY-BACKGROUND SPECTRUM;
DEEP FIELD-SOUTH;
XMM-NEWTON;
TO;
RADIATION PRESSURE;
STAR-FORMATION;
SWIFT BAT;
GALAXIES;
D O I:
10.1088/2041-8205/715/2/L99
中图分类号:
P1 [天文学];
学科分类号:
0704 ;
摘要:
Previous studies of the active galactic nuclei (AGNs) contribution to the cosmic X-ray background (CXB) consider only observable parameters such as luminosity and absorbing column. Here, for the first time, we extend the study of the CXB to physical parameters including the Eddington ratio of the sources and the black hole mass. In order to calculate the contribution to the CXB of AGN accreting at various Eddington ratios, an evolving Eddington ratio space density model is calculated. In particular, Compton thick (CT) AGNs are modeled as accreting at specific, physically motivated Eddington ratios instead of as a simple extension of the Compton thin type 2 AGN population. Comparing against the observed CT AGN space densities and log N-log S relation indicates that CT AGNs are likely a composite population of AGNs made up of sources accreting either at >90% or <1% of their Eddington rate.
引用
收藏
页码:L99 / L103
页数:5
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