A NEW CATALOG OF TYPE 1 AGNs AND ITS IMPLICATIONS ON THE AGN UNIFIED MODEL

被引:397
作者
Oh, Kyuseok [1 ]
Yi, Sukyoung K. [2 ,3 ]
Schawinski, Kevin [1 ]
Koss, Michael [1 ]
Trakhtenbrot, Benny [1 ]
Soto, Kurt [1 ]
机构
[1] ETH, Dept Phys, Inst Astron, CH-8093 Zurich, Switzerland
[2] Yonsei Univ, Dept Astron, Seoul 120749, South Korea
[3] Yonsei Univ, Yonsei Univ Observ, Seoul 120749, South Korea
基金
瑞士国家科学基金会; 新加坡国家研究基金会;
关键词
galaxies: active; galaxies: nuclei; galaxies: Seyfert; galaxies: statistics; methods: data analysis; quasars: general; ACTIVE GALACTIC NUCLEI; DIGITAL SKY SURVEY; STAR-FORMATION RATE; SUPERMASSIVE BLACK-HOLES; HOST GALAXIES; SEYFERT-GALAXIES; PARAMETER-ESTIMATION; QUASAR FRACTION; LOW-LUMINOSITY; LINE SPECTRA;
D O I
10.1088/0067-0049/219/1/1
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
We have recently identified a substantial number of type 1 active galactic nuclei (AGNs) featuring weak broad-line regions (BLRs) at z < 0.2 from detailed analysis of galaxy spectra in the Sloan Digital Sky Survey Data Release 7. These objects predominantly show a stellar continuum but also a broad H alpha emission line, indicating the presence of a low-luminosity AGN oriented so that we are viewing the central engine directly without significant obscuration. These accreting black holes have previously eluded detection due to their weak nature. The newly discovered BLR AGNs have increased the number of known type 1 AGNs by 49%. Some of these new BLR AGNs were detected with the Chandra X-ray Observatory, and their X-ray properties confirm that they are indeed type 1 AGNs. Based on our new and more complete catalog of type 1 AGNs, we derived the type 1 fraction of AGNs as a function of [O III] lambda 5007 emission luminosity and explored the possible dilution effect on obscured AGNs due to star formation. The new type 1 AGN fraction shows much more complex behavior with respect to black hole mass and bolometric luminosity than has been suggested previously by the existing receding torus model. The type 1 AGN fraction is sensitive to both of these factors, and there seems to be a sweet spot (ridge) in the diagram of black hole mass and bolometric luminosity. Furthermore, we present the possibility that the Eddington ratio plays a role in determining opening angles.
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页数:17
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