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A Tidal Disruption Event Candidate Discovered in the Active Galactic Nucleus SDSS J022700.77-042020.6

文献类型：期刊论文

作者Liu, Zhu1; Li, Dongyue1,2; Liu, He-Yang1,2; Lu, Youjun2,3; Yuan, Weimin1,2; Dou, Liming4; Shen, Rong-Feng5
刊名ASTROPHYSICAL JOURNAL
出版日期2020-05-01
卷号894期号:2页码:12
关键词Tidal disruption Active galactic nuclei
ISSN号0004-637X
DOI10.3847/1538-4357/ab880f
英文摘要We report the discovery of a tidal disruption event (TDE) candidate occurring in the active galactic nucleus (AGN) SDSS J022700.77-042020.6. A sudden increase in flux from J0227-0420 during the second half of 2009 appears in the long-term optical, UV, and near-IR (NIR) light curves. A plateau phase, following an initial decline, is seen in the near-UV (NUV) and optical light curves. We find possible evidence that the plateau in the NUV band may lag behind the optical ones by similar to 70-80 days with also a much shorter duration, that is, similar to 7-15 days against similar to 40-50 days. The long-term NUV/optical (after the plateau phase), NIR, and mid-infrared (MIR) light curves can be well characterized with a form of L(t) proportional to t(-beta), consistent with the expectation of a TDE. The plateaus can be explained if stellar streams collide with the preexisting disk at different radii. Though the overall fallback rate decreases, the material in the outer disk drifts inward and increases the local accretion rate in the inner region, producing the NUV/optical plateaus. The possible lag is then attributed to viscosity delay. The index beta of the NIR J, H, and K-s bands (similar to 1.4-3.3) is steeper than that of the UV/optical (similar to 0.7-1.3) and MIR bands (similar to 0.9-1.8), which may suggest that a certain fraction of the dust in the inner region of the torus may be sublimated during the TDE phase. Our results indicate that, due to collisions between stellar debris and the preexisting disk, the light curves of TDEs occurring in AGNs may show distinctive features, which may shed new light on the accretion process.
WOS关键词BLACK-HOLE MASSES ; PHOTON IMAGING CAMERA ; DIGITAL SKY SURVEY ; XMM-NEWTON ; EMISSION ; GALAXIES ; FLARE ; STAR ; VARIABILITY ; EVOLUTION
资助项目Strategic Pioneer Program on Space Science, Chinese Academy of Sciences[XDA15052100] ; Strategic Priority Research Program of the Chinese Academy of Sciences[XDB23040100] ; National Natural Science Foundation of China[11673026] ; National Natural Science Foundation of China[U1631238] ; ESA Member States ; NASA ; National Aeronautics and Space Administration
WOS研究方向Astronomy & Astrophysics
语种英语
WOS记录号WOS:000534288600001
出版者IOP PUBLISHING LTD
资助机构Strategic Pioneer Program on Space Science, Chinese Academy of Sciences ; Strategic Pioneer Program on Space Science, Chinese Academy of Sciences ; Strategic Priority Research Program of the Chinese Academy of Sciences ; Strategic Priority Research Program of the Chinese Academy of Sciences ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; ESA Member States ; ESA Member States ; NASA ; NASA ; National Aeronautics and Space Administration ; National Aeronautics and Space Administration ; Strategic Pioneer Program on Space Science, Chinese Academy of Sciences ; Strategic Pioneer Program on Space Science, Chinese Academy of Sciences ; Strategic Priority Research Program of the Chinese Academy of Sciences ; Strategic Priority Research Program of the Chinese Academy of Sciences ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; ESA Member States ; ESA Member States ; NASA ; NASA ; National Aeronautics and Space Administration ; National Aeronautics and Space Administration ; Strategic Pioneer Program on Space Science, Chinese Academy of Sciences ; Strategic Pioneer Program on Space Science, Chinese Academy of Sciences ; Strategic Priority Research Program of the Chinese Academy of Sciences ; Strategic Priority Research Program of the Chinese Academy of Sciences ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; ESA Member States ; ESA Member States ; NASA ; NASA ; National Aeronautics and Space Administration ; National Aeronautics and Space Administration ; Strategic Pioneer Program on Space Science, Chinese Academy of Sciences ; Strategic Pioneer Program on Space Science, Chinese Academy of Sciences ; Strategic Priority Research Program of the Chinese Academy of Sciences ; Strategic Priority Research Program of the Chinese Academy of Sciences ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; ESA Member States ; ESA Member States ; NASA ; NASA ; National Aeronautics and Space Administration ; National Aeronautics and Space Administration
源URL[http://ir.bao.ac.cn/handle/114a11/54618]  
专题中国科学院国家天文台
通讯作者Liu, Zhu
作者单位1.Chinese Acad Sci, Natl Astron Observ, Key Lab Space Astron & Technol, Beijing 100101, Peoples R China
2.Univ Chinese Acad Sci, Sch Astron & Space Sci, Beijing 100049, Peoples R China
3.Chinese Acad Sci, Natl Astron Observ, Beijing 100101, Peoples R China
4.Guangzhou Univ, Ctr Astrophys, Guangzhou 510006, Peoples R China
5.Sun Yat Sen Univ, Sch Phys & Astron, Zhuhai 519082, Guangdong, Peoples R China
推荐引用方式
GB/T 7714		 Liu, Zhu,Li, Dongyue,Liu, He-Yang,et al. A Tidal Disruption Event Candidate Discovered in the Active Galactic Nucleus SDSS J022700.77-042020.6[J]. ASTROPHYSICAL JOURNAL,2020,894(2):12.
APA Liu, Zhu.,Li, Dongyue.,Liu, He-Yang.,Lu, Youjun.,Yuan, Weimin.,...&Shen, Rong-Feng.(2020).A Tidal Disruption Event Candidate Discovered in the Active Galactic Nucleus SDSS J022700.77-042020.6.ASTROPHYSICAL JOURNAL,894(2),12.
MLA Liu, Zhu,et al."A Tidal Disruption Event Candidate Discovered in the Active Galactic Nucleus SDSS J022700.77-042020.6".ASTROPHYSICAL JOURNAL 894.2(2020):12.

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