COEXISTENCE OF GRAVITATIONALLY-BOUND AND RADIATION-DRIVEN C IV EMISSION LINE REGIONS IN ACTIVE GALACTIC NUCLEI
文献类型：期刊论文
| 作者 | Wang, Huiyuan1,2; Wang, Tinggui1,2; Zhou, Hongyan1,2,3; Liu, Bo1,2; Wang, Jianguo4; Yuan, Weimin5 ; Dong, Xiaobo1,2,6
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| 刊名 | ASTROPHYSICAL JOURNAL
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| 出版日期 | 2011-09-01 |
| 卷号 | 738期号:1 |
| 关键词 | line: formation line: profiles quasars: emission lines quasars: general |
| 英文摘要 | There are mutually contradictory views in the literature of the kinematics and structure of high-ionization line (e. g., C IV) emitting regions in active galactic nuclei (AGNs). Two kinds of broad emission line region (BELR) models have been proposed, outflow and gravitationally-bound BELR, which are supported, respectively, by blueshift of the C IV line and reverberation mapping observations. To reconcile these two apparently different models, we present a detailed comparison study between the C IV and Mg II lines using a sample of AGNs selected from the Sloan Digital Sky Survey. We find that the kinematics of the C IV region is different from that of Mg II, which is thought to be controlled by gravity. A strong correlation is found between the blueshift and asymmetry of the C IV profile and the Eddington ratio. This provides strong observational support for the postulation that the outflow is driven by radiation pressure. In particular, we find robust evidence that the C IV line region is largely dominated by outflow at high Eddington ratios, while it is primarily gravitationally-bounded at low Eddington ratios. Our results indicate that these two emitting regions coexist in most AGNs. The emission strength from these two gases varies smoothly with Eddington ratio in opposite ways. This explanation naturally reconciles the apparently contradictory views proposed in previous studies. Finally, candidate models are discussed which can account for both the enhancement of outflow emission and suppression of normal BEL in AGNs with high Eddington ratios. |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000294015500085 |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/7837]  |
| 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.Univ Sci & Technol China, Dept Astron, Hefei 230026, Anhui, Peoples R China 3.Polar Res Inst China, Shanghai 200136, Peoples R China 4.Chinese Acad Sci, Natl Astron Observ, Yunnan Observ, Kunming 650011, Yunnan, Peoples R China 5.Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China 6.Observ Carnegie Inst Sci, Pasadena, CA 91101 USA |
| 推荐引用方式 GB/T 7714 | Wang, Huiyuan,Wang, Tinggui,Zhou, Hongyan,et al. COEXISTENCE OF GRAVITATIONALLY-BOUND AND RADIATION-DRIVEN C IV EMISSION LINE REGIONS IN ACTIVE GALACTIC NUCLEI[J]. ASTROPHYSICAL JOURNAL,2011,738(1). |
| APA | Wang, Huiyuan.,Wang, Tinggui.,Zhou, Hongyan.,Liu, Bo.,Wang, Jianguo.,...&Dong, Xiaobo.(2011).COEXISTENCE OF GRAVITATIONALLY-BOUND AND RADIATION-DRIVEN C IV EMISSION LINE REGIONS IN ACTIVE GALACTIC NUCLEI.ASTROPHYSICAL JOURNAL,738(1). |
| MLA | Wang, Huiyuan,et al."COEXISTENCE OF GRAVITATIONALLY-BOUND AND RADIATION-DRIVEN C IV EMISSION LINE REGIONS IN ACTIVE GALACTIC NUCLEI".ASTROPHYSICAL JOURNAL 738.1(2011). |
入库方式： OAI收割
来源：国家天文台
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