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A SYSTEMATIC ANALYSIS OF Fe II EMISSION IN QUASARS: EVIDENCE FOR INFLOW TO THE CENTRAL BLACK HOLE
Hu, Chen1,2,3; Wang, Jian-Min2; Ho, Luis C.4; Chen, Yan-Mei2,3; Zhang, Hao-Tong1; Bian, Wei-Hao2,5,6; Xue, Sui-Jian1
2008-11-01
Source PublicationASTROPHYSICAL JOURNAL
Volume687Issue:1Pages:78-96
AbstractBroad 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.
KeywordGalaxies: Nuclei Line: Profiles Quasars: Emission Lines Quasars: General Galaxies: Seyfert
Indexed BySCI
Language英语
WOS IDWOS:000260370800008
Citation statistics
Document Type期刊论文
Identifierhttp://ir.bao.ac.cn/handle/114a11/8367
Collection光学天文研究部
Affiliation1.Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China
2.Inst High Energy Phys, Key Lab Particle Astrophys, Beijing 100039, Peoples R China
3.Chinese Acad Sci, Grad Univ, Beijing 100049, Peoples R China
4.Carnegie Inst Washington Observ, Pasadena, CA 91101 USA
5.Nanjing Normal Univ, Dept Phys, Nanjing, Peoples R China
6.Nanjing Normal Univ, Inst Theoret Phys, Nanjing, Peoples R China
Recommended Citation
GB/T 7714
Hu, Chen,Wang, Jian-Min,Ho, Luis C.,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):78-96.
APA Hu, Chen.,Wang, Jian-Min.,Ho, Luis C..,Chen, Yan-Mei.,Zhang, Hao-Tong.,...&Xue, Sui-Jian.(2008).A SYSTEMATIC ANALYSIS OF Fe II EMISSION IN QUASARS: EVIDENCE FOR INFLOW TO THE CENTRAL BLACK HOLE.ASTROPHYSICAL JOURNAL,687(1),78-96.
MLA Hu, Chen,et al."A SYSTEMATIC ANALYSIS OF Fe II EMISSION IN QUASARS: EVIDENCE FOR INFLOW TO THE CENTRAL BLACK HOLE".ASTROPHYSICAL JOURNAL 687.1(2008):78-96.
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