A SYSTEMATIC ANALYSIS OF Fe II EMISSION IN QUASARS: EVIDENCE FOR INFLOW TO THE CENTRAL BLACK HOLE
Hu C(胡晨); Wang JM(王建民); Chen YM(陈燕梅); Bian WH(卞维豪); Hu, C; Wang, JM; Ho, LC; Chen, YM; Zhang, HT; Bian, WH; Xue, SJ
刊名ASTROPHYSICAL JOURNAL
2008
卷号687期号:1页码:#REF!
关键词galaxies: nuclei line: profiles quasars: emission lines quasars: general galaxies: Seyfert
学科分类Astronomy & Astrophysics
DOI10.1086/591838
通讯作者Hu, C (reprint author), Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China.
文章类型Article
英文摘要Broad Fe II emission is a prominent feature of the optical and ultraviolet spectra of quasars. We report on a systematical investigation of optical Fe II emission in a large sample of 4037 z < 0.8 quasars selected from the Sloan Digital Sky Survey. We have developed and tested a detailed line-fitting technique, taking into account the complex continuum and narrow and broad emission-line spectra. Our primary goal is to quantify the velocity broadening and velocity shift of the Fe II spectrum in order to constrain the location of the Fe II-emitting region and its relation to the broad-line region. We find that the majority of quasars show Fe II emission that is redshifted, typically by similar to 400 km s(-1), but up to 2000 kms (-1), with respect to the systemic velocity of the narrow-line region or of the conventional broad-line region as traced by the H beta line. Moreover, the line width of Fe II is significantly narrower than that of the broad component of H beta. We show that the magnitude of the Fe II redshift correlates inversely with the Eddington ratio, and that there is a tendency for sources with redshifted Fe II emission to show red asymmetry in the H beta line. These characteristics strongly suggest that Fe II originates from a location different from, and most likely exterior to, the region that produces most of H beta. The Fe II-emitting zone traces a portion of the broad-line region of intermediate velocities whose dynamics may be dominated by infall.
类目[WOS]Astronomy & Astrophysics
收录类别SCI
WOS记录号WOS:000260370800008
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被引频次:77[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/311005/225990
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
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Hu C,Wang JM,Chen YM,et al. A SYSTEMATIC ANALYSIS OF Fe II EMISSION IN QUASARS: EVIDENCE FOR INFLOW TO THE CENTRAL BLACK HOLE[J]. ASTROPHYSICAL JOURNAL,2008,687(1):#REF!.
APA 胡晨.,王建民.,陈燕梅.,卞维豪.,Hu, C.,...&Xue, SJ.(2008).A SYSTEMATIC ANALYSIS OF Fe II EMISSION IN QUASARS: EVIDENCE FOR INFLOW TO THE CENTRAL BLACK HOLE.ASTROPHYSICAL JOURNAL,687(1),#REF!.
MLA 胡晨,et al."A SYSTEMATIC ANALYSIS OF Fe II EMISSION IN QUASARS: EVIDENCE FOR INFLOW TO THE CENTRAL BLACK HOLE".ASTROPHYSICAL JOURNAL 687.1(2008):#REF!.
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