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	A single intrinsic luminosity function for both type I and type II active galactic nuclei
	Shuang Nan Zhang
	2010-05-06 ; 2010-05-06
关键词	Theoretical or Mathematical/ accretion disks galactic nuclei Seyfert galaxies X-ray sources (astronomical)/ single intrinsic luminosity function type II active galactic nuclei type I active galactic nuclei luminous electromagnetic emission type I AGN type II AGN quasars supermassive black holes standard unification model X-ray-emitting accretion disk dusty torus deep AGN surveys X-ray luminosity AGN unification model inclination angle effects/ A9850R Active and peculiar galaxies A9850E Galactic structure, content and morphology A9850G Radiation and spectra of galaxies A9870Q Cosmic X-ray sources
中文摘要	The luminous electromagnetic emission from distant active galactic nuclei (AGNs) including quasars is believed to be powered by accretion onto supermassive black holes. In the standard unification model for AGNs, a dusty torus covers a significant portion of the viewing angles to the accretion disk and the black hole. The system is classified as a type I AGN if the accretion disk is viewed through the opening part; otherwise, it is called a type II AGN. Therefore, the ratio of type II to type I AGNs serves as a sensitive probe to the unification model. A surprising discovery made from several large sky coverage and/or deep AGN surveys is a significant anticorrelation between the type II fraction and the observed X-ray luminosity between 2 and 10 keV. This suggests two different luminosity functions for the two types of AGNs, thus challenging the AGN unification model. However, this observed anticorrelation is a natural consequence of the AGN unification model with only one intrinsic luminosity function if the inclination angle effects of the X-ray-emitting accretion disk are taken into account. Thus, the AGN unification model survived another critical test.
语种	英语 ; 英语
出版者	University of Chicago Press for American Astron. Soc ; USA
内容类型	期刊论文
源URL	[http://hdl.handle.net/123456789/15466]
专题	清华大学
推荐引用方式 GB/T 7714	Shuang Nan Zhang. A single intrinsic luminosity function for both type I and type II active galactic nuclei[J],2010, 2010.
APA	Shuang Nan Zhang.(2010).A single intrinsic luminosity function for both type I and type II active galactic nuclei..
MLA	Shuang Nan Zhang."A single intrinsic luminosity function for both type I and type II active galactic nuclei".(2010).

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