STAR FORMATION IN SELF-GRAVITATING DISKS IN ACTIVE GALACTIC NUCLEI. I. METALLICITY GRADIENTS IN BROAD-LINE REGIONS
文献类型：期刊论文
| 作者 | Wang, Jian-Min1,2; Ge, Jun-Qiang1 ; Hu, Chen1; Baldwin, Jack A.3; Li, Yan-Rong1; Ferland, Gary J.4; Xiang, Fei; Yan, Chang-Shuo2; Zhang, Shu1
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| 刊名 | ASTROPHYSICAL JOURNAL
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| 出版日期 | 2011-09-20 |
| 卷号 | 739期号:1 |
| 关键词 | black hole physics galaxies: evolution quasars: general |
| 英文摘要 | It has been suggested that the high metallicity generally observed in active galactic nuclei (AGNs) and quasars originates from ongoing star formation in the self-gravitating part of accretion disks around supermassive black holes (SMBHs). We designate this region as the star-forming (SF) disk, in which metals are produced from supernova explosions (SNexp) while at the same time inflows are driven by SNexp-excited turbulent viscosity to accrete onto the SMBHs. In this paper, an equation of metallicity governed by SNexp and radial advection is established to describe the metal distribution and evolution in the SF disk. We find that the metal abundance is enriched at different rates at different positions in the disk, and that a metallicity gradient is set up that evolves for steady-state AGNs. Metallicity as an integrated physical parameter can be used as a probe of the SF disk age during one episode of SMBH activity. In the SF disk, evaporation of molecular clouds heated by SNexp blast waves unavoidably forms hot gas. This heating is eventually balanced by the cooling of the hot gas, but we show that the hot gas will escape from the SF disk before being cooled, and diffuse into the broad-line regions (BLRs) forming with a typical rate of similar to 1 M-circle dot yr(-1). The diffusion of hot gas from an SF disk depends on ongoing star formation, leading to the metallicity gradients in BLR observed in AGNs. We discuss this and other observable consequences of this scenario. |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000294955700003 |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/7903]  |
| 专题 | 国家天文台_星系宇宙学研究部 |
| 作者单位 | 1.Chinese Acad Sci, Key Lab Particle Astrophys, Inst High Energy Phys, Beijing 100049, Peoples R China 2.Chinese Acad Sci, Natl Astron Observ China, Beijing 100020, Peoples R China 3.Michigan State Univ, Dept Phys & Astron, E Lansing, MI 48824 USA 4.Univ Kentucky, Dept Phys & Astron, Lexington, KY 40506 USA |
| 推荐引用方式 GB/T 7714 | Wang, Jian-Min,Ge, Jun-Qiang,Hu, Chen,et al. STAR FORMATION IN SELF-GRAVITATING DISKS IN ACTIVE GALACTIC NUCLEI. I. METALLICITY GRADIENTS IN BROAD-LINE REGIONS[J]. ASTROPHYSICAL JOURNAL,2011,739(1). |
| APA | Wang, Jian-Min.,Ge, Jun-Qiang.,Hu, Chen.,Baldwin, Jack A..,Li, Yan-Rong.,...&Zhang, Shu.(2011).STAR FORMATION IN SELF-GRAVITATING DISKS IN ACTIVE GALACTIC NUCLEI. I. METALLICITY GRADIENTS IN BROAD-LINE REGIONS.ASTROPHYSICAL JOURNAL,739(1). |
| MLA | Wang, Jian-Min,et al."STAR FORMATION IN SELF-GRAVITATING DISKS IN ACTIVE GALACTIC NUCLEI. I. METALLICITY GRADIENTS IN BROAD-LINE REGIONS".ASTROPHYSICAL JOURNAL 739.1(2011). |
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来源：国家天文台
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