EXTREME CORONAL LINE EMITTERS: TIDAL DISRUPTION OF STARS BY MASSIVE BLACK HOLES IN GALACTIC NUCLEI?
文献类型：期刊论文
| 作者 | Wang, Ting-Gui1,2; Zhou, Hong-Yan1,2,3; Komossa, S.4,5,6; Wang, Hui-Yuan1,2; Yuan, Weimin6 ; Yang, Chenwei1,2
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| 刊名 | ASTROPHYSICAL JOURNAL
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| 出版日期 | 2012-04-01 |
| 卷号 | 749期号:2 |
| 关键词 | black hole physics galaxies: nuclei line: formation supernovae: general |
| 英文摘要 | Tidal disruption of stars by supermassive black holes at the centers of galaxies is expected to produce unique emission-line signatures, which have not yet been explored adequately. Here we report the discovery of extremely strong coronal lines from [Fe X] up to [Fe XIV] in a sample of seven galaxies (including two recently reported cases), which we interpret as such signatures. This is the first systematic search for objects of this kind, by making use of the immense database of the Sloan Digital Sky Survey. The galaxies, which are non-active as evidenced by the narrow line ratios, show broad emission lines of complex profiles in more than half of the sample. Both the high-ionization coronal lines and the broad lines are fading on timescales of years in objects observed with spectroscopic follow-ups, suggesting their transient nature. Variations of inferred non-stellar continua, which have absolute magnitudes of at least -16 to -18 mag in the g band, are also detected in more than half of the sample. The coronal line emitters reside in sub-L-* disk galaxies (-21.3< M-i < -18.5) with small stellar velocity dispersions. The sample seems to form two distinct types based on the presence or absence of the [Fe VII] lines, with the latter having relatively low luminosities of [O III], [Fe XI], and the host galaxies. These characteristics can most naturally be understood in the context of transient accretion onto intermediate-mass black holes at galactic centers following tidal disruption of stars in a gas-rich environment. We estimate the incidence of such events to be around 10(-5) yr(-1) for a galaxy with -21.3 < M-i < -18.5. |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000302785700019 |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/6095]  |
| 专题 | 国家天文台_空间科学研究部 |
| 作者单位 | 1.Univ Sci & Technol China, Key Lab Res Galaxies & Cosmol, Chinese Acad Sci, Hefei 230026, Anhui, Peoples R China 2.Univ Sci & Technol China, Ctr Astrophys, Hefei 230026, Anhui, Peoples R China 3.Polar Res Inst China, Shanghai 200136, Peoples R China 4.Tech Univ Munich, Fak Phys, Lehrstuhl Phys 1, D-85748 Garching, Germany 5.Max Planck Inst Plasma Phys, D-85748 Garching, Germany 6.Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China |
| 推荐引用方式 GB/T 7714 | Wang, Ting-Gui,Zhou, Hong-Yan,Komossa, S.,et al. EXTREME CORONAL LINE EMITTERS: TIDAL DISRUPTION OF STARS BY MASSIVE BLACK HOLES IN GALACTIC NUCLEI?[J]. ASTROPHYSICAL JOURNAL,2012,749(2). |
| APA | Wang, Ting-Gui,Zhou, Hong-Yan,Komossa, S.,Wang, Hui-Yuan,Yuan, Weimin,&Yang, Chenwei.(2012).EXTREME CORONAL LINE EMITTERS: TIDAL DISRUPTION OF STARS BY MASSIVE BLACK HOLES IN GALACTIC NUCLEI?.ASTROPHYSICAL JOURNAL,749(2). |
| MLA | Wang, Ting-Gui,et al."EXTREME CORONAL LINE EMITTERS: TIDAL DISRUPTION OF STARS BY MASSIVE BLACK HOLES IN GALACTIC NUCLEI?".ASTROPHYSICAL JOURNAL 749.2(2012). |
入库方式： OAI收割
来源：国家天文台
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