ON THE UNIFICATION OF ACTIVE GALACTIC NUCLEI

被引：155
作者：
Elitzur, Moshe [1 ]
机构：
[1] Univ Kentucky, Dept Phys & Astron, Lexington, KY 40506 USA
来源：
ASTROPHYSICAL JOURNAL LETTERS | 2012年 / 747卷 / 02期
关键词：
galaxies: active; galaxies: nuclei; galaxies: Seyfert; infrared: galaxies; quasars: general; SPECTRAL ENERGY-DISTRIBUTIONS; AGN DUSTY TORI; SEYFERT-GALAXIES; UNIFIED SCHEMES; EMISSION; OBSCURATION; QUASARS; MODELS; SAMPLE; IR;
D O I：
10.1088/2041-8205/747/2/L33
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
The inevitable spread in properties of the toroidal obscuration of active galactic nuclei (AGNs) invalidates the widespread notion that type 1 and 2 AGNs are intrinsically the same objects, drawn randomly from the distribution of torus covering factors. Instead, AGNs are drawn preferentially from the distribution; type 2 are more likely drawn from the distribution higher end, type 1 from its lower end. Type 2 AGNs have a higher IR luminosity, lower narrow-line luminosity, and a higher fraction of Compton thick X-ray obscuration than type 1. Meaningful studies of unification statistics cannot be conducted without first determining the intrinsic distribution function of torus covering factors.
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