WHAT CONTROLS THE Fe II STRENGTH IN ACTIVE GALACTIC NUCLEI?
文献类型：期刊论文
| 作者 | Dong, Xiao-Bo1,2; Wang, Jian-Guo1,3,4,5,6; Ho, Luis C.2; Wang, Ting-Gui1; Fan, Xiaohui7,8; Wang, Huiyuan1; Zhou, Hongyan1; Yuan, Weimin3,4,5
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| 刊名 | ASTROPHYSICAL JOURNAL
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| 出版日期 | 2011-08-01 |
| 卷号 | 736期号:2 |
| 关键词 | accretion, accretion disks galaxies: active line: formation quasars: emission lines quasars: general |
| 英文摘要 | We used a large, homogeneous sample of 4178 z <= 0.8 Seyfert 1 galaxies and QSOs selected from the Sloan Digital Sky Survey to investigate the strength of Fe II emission and its correlation with other emission lines and physical parameters of active galactic nuclei. We find that the strongest correlations of almost all the emission-line intensity ratios and equivalent widths (EWs) are with the Eddington ratio (L/L-Edd), rather than with the continuum luminosity at 5100 angstrom (L-5100) or black hole mass (M-BH); the only exception is the EW of ultraviolet Fe II emission, which does not correlate at all with broad-line width, L-5100, M-BH, or L/L-Edd. By contrast, the intensity ratios of both the ultraviolet and optical Fe II emission to MgII lambda 2800 correlate quite strongly with L/L-Edd. Interestingly, among all the emission lines in the near-UV and optical studied in this paper (including MgII lambda 2800, H beta, and [O III]lambda 5007), the EW of narrow optical Fe II emission has the strongest correlation with L/L-Edd. We hypothesize that the variation of the emission-line strength in active galaxies is regulated by L/L-Edd because it governs the global distribution of the hydrogen column density of the clouds gravitationally bound in the line-emitting region, as well as its overall gas supply. The systematic dependence on L/L-Edd must be corrected when using the Fe II/MgII intensity ratio as a measure of the Fe/Mg abundance ratio to study the history of chemical evolution in QSO environments. |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000292977400011 |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/7969]  |
| 专题 | 国家天文台_空间科学研究部 |
| 作者单位 | 1.Univ Sci & Technol China, Chinese Acad Sci, Key Lab Res Galaxies & Cosmol, Hefei 230026, Anhui, Peoples R China 2.Carnegie Inst Sci, Pasadena, CA 91101 USA 3.Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China 4.Chinese Acad Sci, Yunnan Observ, Natl Astron Observ, Kunming 650011, Peoples R China 5.Chinese Acad Sci, Key Lab Struct & Evolut Celestial Objects, Kunming 650011, Peoples R China 6.Chinese Acad Sci, Grad Sch, Beijing 100039, Peoples R China 7.Univ Arizona, Steward Observ, Tucson, AZ 85721 USA 8.Max Planck Inst Astron, D-69120 Heidelberg, Germany |
| 推荐引用方式 GB/T 7714 | Dong, Xiao-Bo,Wang, Jian-Guo,Ho, Luis C.,et al. WHAT CONTROLS THE Fe II STRENGTH IN ACTIVE GALACTIC NUCLEI?[J]. ASTROPHYSICAL JOURNAL,2011,736(2). |
| APA | Dong, Xiao-Bo.,Wang, Jian-Guo.,Ho, Luis C..,Wang, Ting-Gui.,Fan, Xiaohui.,...&Yuan, Weimin.(2011).WHAT CONTROLS THE Fe II STRENGTH IN ACTIVE GALACTIC NUCLEI?.ASTROPHYSICAL JOURNAL,736(2). |
| MLA | Dong, Xiao-Bo,et al."WHAT CONTROLS THE Fe II STRENGTH IN ACTIVE GALACTIC NUCLEI?".ASTROPHYSICAL JOURNAL 736.2(2011). |
入库方式： OAI收割
来源：国家天文台
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