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

	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, S.1; Zhou, H.1,2; Wang, T.2; Ajello, M.1; Ge, J.3 ; Greiner, J.1; Lu, H.2; Salvato, M.4; Saxton, R.5; Shan, H.6
刊名	ASTROPHYSICAL JOURNAL LETTERS
	2008-05-01
卷号	678 期号:1 页码:L13-L16
关键词	galaxies : active galaxies : evolution galaxies : individual (SDSS J095209.56+214313.3) quasars : emission lines
英文摘要	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.
收录类别	SCI
语种	英语
WOS记录号	WOS:000255238900004
内容类型	期刊论文
源URL	[http://ir.bao.ac.cn/handle/114a11/7433]
专题	国家天文台_光学天文研究部
作者单位	1.Max Planck Inst Extraterr Phys, D-85741 Garching, Germany 2.Univ Sci & Technol China, Ctr Astrophys, Hefei 230026, Anhui, Peoples R China 3.Univ Florida, Dept Astron, Gainesville, FL 32611 USA 4.CALTECH, Pasadena, CA 91125 USA 5.ESA ESAC, Madrid 28691, Spain 6.Chinese Acad Sci, Yunnan Observ, Natl Astron Observ, Kunming, Peoples R China 7.Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R 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..,...&Yuan, W..(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.