A SYSTEMATIC ANALYSIS OF Fe II EMISSION IN QUASARS: EVIDENCE FOR INFLOW TO THE CENTRAL BLACK HOLE
文献类型：期刊论文
| 作者 | 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
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| 刊名 | ASTROPHYSICAL JOURNAL
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| 出版日期 | 2008 |
| 卷号 | 687期号:1页码:#REF! |
| 关键词 | galaxies: nuclei line: profiles quasars: emission lines quasars: general galaxies: Seyfert |
| 通讯作者 | Hu, C (reprint author), Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China. |
| 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. |
| 学科主题 | Astronomy & Astrophysics |
| 类目[WOS] | Astronomy & Astrophysics |
| 收录类别 | SCI |
| WOS记录号 | WOS:000260370800008 |
| 公开日期 | 2016-05-03 |
| 源URL | [http://ir.ihep.ac.cn/handle/311005/225990]  |
| 专题 | 高能物理研究所_粒子天体物理中心 |
| 推荐引用方式 GB/T 7714 | 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!. |
入库方式： OAI收割
来源：高能物理研究所
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