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	Discovery of superstrong, fading, iron line emission and double-peaked balmer lines of the galaxy sdss j095209.56+214313.3: The light echo of a huge flare
	Komossa, S1; Zhou, H1,2; Wang, T2; Ajello, M1; Ge, J3; Greiner, J1; Lu, H2; Salvato, M4; Saxton, R5; Dan HG(单红光)6; Xu, D7; Yuan WM(袁为民)6; Komossa, S (reprint author), Max Planck Inst Extraterr Phys, Postfach 1312, D-85741 Garching, Germany.
发表期刊	ASTROPHYSICAL JOURNAL LETTERS
	2008-05-01
卷号	678期号:1页码:L13-L16
DOI	10.1086/588281
产权排序	第6完成单位
收录类别	SCI
关键词	Galaxies : Active Galaxies : Evolution Galaxies : Individual (Sdss j095209.56+214313.3) Quasars : Emission Lines
摘要	We report the discovery of superstrong, fading, high-ionization iron line emission in the galaxy SDSS J095209.56 + 214313.3 ( SDSS J0952 + 2143 hereafter), which must have been caused by an X-ray outburst of large amplitude. SDSS J0952 + 2143 is unique in its strong multiwavelength variability; such a broadband emission-line and continuum response has not been observed before. The strong iron line emission is accompanied by unusual Balmer line emission with a broad base, narrow core, and double-peaked narrow horns, and strong He II emission. These lines, while strong in the SDSS spectrum taken in 2005, have faded away significantly in new spectra taken in 2007 December. Comparison of SDSS, 2MASS, GALEX, and follow-up GROND photometry reveals variability in the NUV, optical, and NIR band. Taken together, these unusual observations can be explained by a giant outburst in the EUV-X-ray band, detected even in the optical and NIR. The intense and variable iron, helium, and Balmer lines represent the "light echo" of the flare, as it traveled through circumnuclear material. The outburst may have been caused by the tidal disruption of a star by a supermassive black hole. Spectroscopic surveys such as SDSS are well suited to detect emission-line light echoes of such rare flare events. Reverberation-mapping of these light echoes can then be used as a new and efficient probe of the physical conditions in the circumnuclear material in nonactive or active galaxies.
语种	英语
学科领域	Astronomy & Astrophysics
文章类型	Article
ISSN	2041-8205
URL	查看原文
WOS记录号	WOS:000255238900004
WOS研究方向	Astronomy & Astrophysics
WOS类目	Astronomy & Astrophysics
关键词[WOS]	SUPERMASSIVE BLACK-HOLES ; TIDAL DISRUPTION EVENTS ; ACTIVE GALACTIC NUCLEI ; X-RAY ; STARS ; OUTBURST ; NEARBY ; MASSES
引用统计	被引频次：111[WOS]   [WOS记录]     [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.ynao.ac.cn/handle/114a53/4963
专题	高能天体物理研究组
通讯作者	Komossa, S (reprint author), Max Planck Inst Extraterr Phys, Postfach 1312, D-85741 Garching, Germany.
作者单位	1.Max-Planck-Institut für extraterrestrische Physik, Postfach 1312, 85741 Garching, Germany 2.Center for Astrophysics, University of Science and Technology of China, Hefei, Anhui 230026, China 3.Department of Astronomy, University of Florida, Gainesville, FL 32611 4.California Institute of Technology, 105-24 Robinson, 1200 East California Boulevard, Pasadena, CA 91125 5.ESA/ESAC, Apartado 78, 28691 Villanueva de la Canada, Madrid, Spain 6.National Astronomical Observatories/Yunnan Observatory, Chinese Academy of Science, P.O. Box 110, Kunming, China 7.National Astronomical Observatories, Chinese Academy of Science, A20 Datun Road, Chaoyang District, Beijing 100012, China
推荐引用方式 GB/T 7714	Komossa, S,Zhou, H,Wang, T,et al. Discovery of superstrong, fading, iron line emission and double-peaked balmer lines of the galaxy sdss j095209.56+214313.3: The light echo of a huge flare[J]. ASTROPHYSICAL JOURNAL LETTERS,2008,678(1):L13-L16.
APA	Komossa, S.,Zhou, H.,Wang, T.,Ajello, M.,Ge, J.,...&Komossa, S .(2008).Discovery of superstrong, fading, iron line emission and double-peaked balmer lines of the galaxy sdss j095209.56+214313.3: The light echo of a huge flare.ASTROPHYSICAL JOURNAL LETTERS,678(1),L13-L16.
MLA	Komossa, S,et al."Discovery of superstrong, fading, iron line emission and double-peaked balmer lines of the galaxy sdss j095209.56+214313.3: The light echo of a huge flare".ASTROPHYSICAL JOURNAL LETTERS 678.1(2008):L13-L16.

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