Line profiles of the two-phase medium broad-line region in active galactic nuclei
文献类型：期刊论文
| 作者 | Xue, SJ; Lin, XB; Cheng, FZ; Kwan, J |
| 刊名 | SCIENCE IN CHINA SERIES A-MATHEMATICS PHYSICS ASTRONOMY
 |
| 出版日期 | 1996-08-01 |
| 卷号 | 39期号:8页码:883-896 |
| 关键词 | active galactic nuclei (AGNs) broad line region (BLR) emission line profiles |
| ISSN号 | 1006-9283 |
| 英文摘要 | In the framework of BLR in AGNs, i.e. large number of small, cold and dense emission-line clouds immerging in an intercloud hot medium a delicate radiation model for a typical emission cloud is established, in which the backside photoionization of the cloud against the central continuum source by the scattered diffuse continuum in the hot medium is considered. Under the assumption of the radial kinematics of the BLR clouds, the line profiles for the two important UV emission-lines, Ly alpha and CIV lambda 1549 are computed; and based on these calculations, various physical factors that affect the properties of the emission-line profiles are discussed. It is concluded that: (i) when the BLR clouds is inflow, there exists a confining hot medium with density around 2x10(5) cm(-3). In this case, theoretical line profiles agree well with the observational; (ii) both symmetric Ly alpha and nearly symmetric CIV line profiles show blue velocity shifts, the quantities of which are sensitive to the cutoff of the outer radius of the BLR. It is suggested that this cutoff effect is physical background to explain the observations that high ionization lines in the spectra of AGNs have some systematic blue shifts relative to those low ionization lines which usually characterize their source system velocities. |
| WOS关键词 | EMISSION ; QUASARS ; NGC-5548 ; STEPS ; SIZE |
| WOS研究方向 | Mathematics |
| 语种 | 英语 |
| WOS记录号 | WOS:A1996WA87100010 |
| 出版者 | SCIENCE CHINA PRESS |
| 源URL | [http://210.72.145.45/handle/361003/11506]  |
| 专题 | 中国科学院国家授时中心 |
| 通讯作者 | Xue, SJ |
| 作者单位 | 1.UNIV MASSACHUSETTS,DEPT PHYS & ASTROPHYS,AMHERST,MA 01003 2.CHINESE ACAD SCI,SHAANXI ASTRON OBSERV,LINTONG 710600,PEOPLES R CHINA |
| 推荐引用方式 GB/T 7714 | Xue, SJ,Lin, XB,Cheng, FZ,et al. Line profiles of the two-phase medium broad-line region in active galactic nuclei[J]. SCIENCE IN CHINA SERIES A-MATHEMATICS PHYSICS ASTRONOMY,1996,39(8):883-896. |
| APA | Xue, SJ,Lin, XB,Cheng, FZ,&Kwan, J.(1996).Line profiles of the two-phase medium broad-line region in active galactic nuclei.SCIENCE IN CHINA SERIES A-MATHEMATICS PHYSICS ASTRONOMY,39(8),883-896. |
| MLA | Xue, SJ,et al."Line profiles of the two-phase medium broad-line region in active galactic nuclei".SCIENCE IN CHINA SERIES A-MATHEMATICS PHYSICS ASTRONOMY 39.8(1996):883-896. |
入库方式： OAI收割
来源：国家授时中心
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