A physical model for active galactic nuclei with double-peaked broad emission lines
文献类型：期刊论文
| 作者 | Cao, Xinwu ; Wang, Ting-Gui
|
| 刊名 | ASTROPHYSICAL JOURNAL
 |
| 出版日期 | 2006-11-20 |
| 卷号 | 652期号:1页码:112-119 |
| 关键词 | accretion accretion disks galaxies : active quasars : emission lines |
| 英文摘要 | The double-peaked broad emission lines are usually thought to be linked to accretion disks; however, the local viscous heating in the line-emitting disk portion is usually insufficient for the observed double-peaked broad-line luminosity in most sources. It was suggested that the X-ray radiation from an ion-supported torus in the inner region of the disk can photoionize the outer line-emitting disk region. However, our calculations show that only a small fraction (less than or similar to 2.3%) of the radiation from the radiatively inefficient accretion flow (RIAF) in the inner region of the disk can photoionize the line-emitting disk portion, because the solid angle of the outer disk portion subtended to the inner region of the RIAF is too small. We propose a physical model for double-peaked line emitters, in which only those AGNs with sufficient matter above the disk (slowly moving jets or outflows) can scatter enough photons radiated from the inner disk region to the outer line-emitting disk portion extending from several hundred to more than 2000 gravitational radii. Our model predicts a power-law r-dependent line emissivity is an element of(H alpha) alpha R-d(-beta), where beta similar to 2.5, which is consistant with beta similar to 2-3 required by the model fittings for double-peaked line profiles. Using a sample of radio-loud AGNs with double-peaked emission lines, we showthat the outer disk regions can be efficiently illuminated by the photons scattered from slow or mild relativistic electron-positron jets with gamma(j) less than or similar to 2. It is consistent with the fact that no double-peaked emission line is present in strong radio quasars with relativistic jets. For radio-quiet double-peaked line emitters, slow outflows with Thomson scattering depth similar to 0.2 instead of jets can scatter sufficient photons to (illuminate) the line-emitting regions. This model can therefore solve the energy budget problem for double-peaked line emitters. |
| 学科主题 | 星系和宇宙学研究中心 |
| WOS标题词 | Science & Technology ; Physical Sciences |
| 类目[WOS] | Astronomy & Astrophysics |
| 研究领域[WOS] | Astronomy & Astrophysics |
| 关键词[WOS] | BLACK-HOLE MASSES ; ADVECTION-DOMINATED ACCRETION ; ELECTRON-POSITRON JETS ; SCALE RADIO JETS ; X-RAY ; HOST GALAXIES ; LOW-LUMINOSITY ; RELATIVISTIC JETS ; QUASARS ; DISK |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000242125700010 |
| 公开日期 | 2010-11-08 |
| 源URL | [http://119.78.226.72//handle/331011/12449]  |
| 专题 | 上海天文台_星系宇宙学重点实验室 |
| 作者单位 | 1.Chinese Acad Sci, Shanghai Astron Observ, Shanghai 200030, Peoples R China 2.Chinese Acad Sci, Joint Inst Galaxy & Cosmol, Shanghai, Peoples R China 3.Univ Sci & Technol China, Ctr Astrophys, Hefei 230026, Peoples R China |
| 推荐引用方式 GB/T 7714 | Cao, Xinwu,Wang, Ting-Gui. A physical model for active galactic nuclei with double-peaked broad emission lines[J]. ASTROPHYSICAL JOURNAL,2006,652(1):112-119. |
| APA | Cao, Xinwu,&Wang, Ting-Gui.(2006).A physical model for active galactic nuclei with double-peaked broad emission lines.ASTROPHYSICAL JOURNAL,652(1),112-119. |
| MLA | Cao, Xinwu,et al."A physical model for active galactic nuclei with double-peaked broad emission lines".ASTROPHYSICAL JOURNAL 652.1(2006):112-119. |
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来源：上海天文台
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