A single intrinsic luminosity function for both type I and type II active galactic nuclei
Zhang SN(张双南); Zhang, SN
刊名ASTROPHYSICAL JOURNAL
2005
卷号618期号:2页码:L79-L82
关键词galaxies : active galaxies : fundamental parameters galaxies : luminosity function, mass function galaxies : Seyfert
学科分类Astronomy & Astrophysics
DOI10.1086/427800
通讯作者Tsing Hua Univ, Dept Phys, Beijing 100084, Peoples R China ; Tsing Hua Univ, Ctr Astrophys, Beijing 100084, Peoples R China ; Univ Alabama, Dept Phys, Huntsville, AL 35899 USA ; NASA, George C Marshall Space Flight Ctr, Space Sci Lab, Huntsville, AL 35812 USA ; Chinese Acad Sci, Inst High Energy Phys, Beijing 100039, Peoples R China
文章类型Article
英文摘要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.
类目[WOS]Astronomy & Astrophysics
研究领域[WOS]Astronomy & Astrophysics
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语种英语
WOS记录号WOS:000226294000005
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被引频次:12[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.ihep.ac.cn/handle/311005/240300
专题中国科学院高能物理研究所_粒子天体物理中心_期刊论文
作者单位中国科学院高能物理研究所
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Zhang SN,Zhang, SN. A single intrinsic luminosity function for both type I and type II active galactic nuclei[J]. ASTROPHYSICAL JOURNAL,2005,618(2):L79-L82.
APA 张双南,&Zhang, SN.(2005).A single intrinsic luminosity function for both type I and type II active galactic nuclei.ASTROPHYSICAL JOURNAL,618(2),L79-L82.
MLA 张双南,et al."A single intrinsic luminosity function for both type I and type II active galactic nuclei".ASTROPHYSICAL JOURNAL 618.2(2005):L79-L82.
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