COEXISTENCE OF GRAVITATIONALLY-BOUND AND RADIATION-DRIVEN C IV EMISSION LINE REGIONS IN ACTIVE GALACTIC NUCLEI
文献类型：会议论文
| 作者 | Wang, HY1,2; Wang, TG1,2; Zhou, HY1,2,3; Liu, B1,2; Wang JG(王建国)4 ; Yuan, WM5; Dong, XB1,2,6
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| 出版日期 | 2011-09-01 |
| 关键词 | line: formation line: profiles quasars: emission lines quasars: general |
| 卷号 | 738 |
| 期号 | 1 |
| 通讯作者 | Wang, HY (reprint author), Univ Sci & Technol China, Chinese Acad Sci, Key Lab Res Galaxies & Cosmol, Hefei 230026, Anhui, Peoples R China. |
| 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 |
| 产权排序 | 第四完成单位 |
| 会议网址 | http://iopscience.iop.org/0004-637X/738/1/85/ |
| 会议录 | ASTROPHYSICAL JOURNAL
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| 学科主题 | Astronomy & Astrophysics |
| 语种 | 英语 |
| ISSN号 | 0004-637X |
| WOS记录号 | WOS:000294015500085 |
| 研究领域[WOS] | Astronomy & Astrophysics |
| WOS标题词 | Science & Technology ; Physical Sciences |
| 源URL | [http://ir.ynao.ac.cn/handle/114a53/5404]  |
| 专题 | 云南天文台_高能天体物理研究组 |
| 作者单位 | 1.Key Laboratory for Research in Galaxies and Cosmology, University of Science and Technology of China, Chinese Academy of Sciences, Hefei, Anhui 230026, China 2.Department of Astronomy, University of Science and Technology of China, Hefei, Anhui 230026, China 3.Polar Research Institute of China, Jinqiao Rd. 451, Shanghai 200136, China 4.National Astronomical Observatories/Yunnan Observatory, Chinese Academy of Sciences, P.O. Box 110, Kunming, Yunnan 650011, China 5.National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012, China 6.The Observatories of the Carnegie Institution for Science, 813 Santa Barbara Street, Pasadena, CA 91101, USA |
| 推荐引用方式 GB/T 7714 | Wang, HY,Wang, TG,Zhou, HY,et al. COEXISTENCE OF GRAVITATIONALLY-BOUND AND RADIATION-DRIVEN C IV EMISSION LINE REGIONS IN ACTIVE GALACTIC NUCLEI[C]. 见:.http://iopscience.iop.org/0004-637X/738/1/85/. |
入库方式： OAI收割
来源：云南天文台
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