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STAR FORMATION IN SELF-GRAVITATING DISKS IN ACTIVE GALACTIC NUCLEI. I. METALLICITY GRADIENTS IN BROAD-LINE REGIONS
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
2011-09-20
Source PublicationASTROPHYSICAL JOURNAL
Volume739Issue:1
AbstractIt 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.
KeywordBlack Hole Physics Galaxies: Evolution Quasars: General
DOI10.1088/0004-637X/739/1/3
Indexed BySCI
Language英语
WOS IDWOS:000294955700003
Citation statistics
Cited Times:15[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.bao.ac.cn/handle/114a11/7903
Collection星系宇宙学研究部
Affiliation1.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
Recommended Citation
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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