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COEXISTENCE OF GRAVITATIONALLY-BOUND AND RADIATION-DRIVEN C IV EMISSION LINE REGIONS IN ACTIVE GALACTIC NUCLEI
Wang, Huiyuan1,2; Wang, Tinggui1,2; Zhou, Hongyan1,2,3; Liu, Bo1,2; Wang, Jianguo4; Yuan, Weimin5; Dong, Xiaobo1,2,6
2011-09-01
Source PublicationASTROPHYSICAL JOURNAL
Volume738Issue:1
AbstractThere 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.
KeywordLine: Formation Line: Profiles Quasars: Emission Lines Quasars: General
DOI10.1088/0004-637X/738/1/85
Indexed BySCI
Language英语
WOS IDWOS:000294015500085
Citation statistics
Document Type期刊论文
Identifierhttp://ir.bao.ac.cn/handle/114a11/7837
Collection空间科学研究部
Affiliation1.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
Recommended Citation
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).
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