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arXiv 0804.2670astro-ph
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发现SDSSJ0952 +2143星系超强、衰落、铁谱线发射和双峰巴耳末谱线--巨大耀斑的光回波

Discovery of superstrong, fading, iron line emission and double-peaked Balmer lines of the galaxy SDSSJ0952+2143 - the light echo of a huge flare

S. Komossa, H. Zhou, T. Wang, M. Ajello, J. Ge, J. Greiner, H. Lu, M. Salvato, R. Saxton, H. Shan, D. Xu, W. Yuan

摘要:

我们报告了在星系SDSSJ 095209.56 +214313.3(以下简称SDSSJ 0952 +2143)中发现的超强、衰落、高电离铁谱线发射,这一定是由大振幅的X射线爆发引起的。SDSSJ 0952 +2143在其强多波长可变性方面是独一无二的;以前从未观察到这样的宽带发射线和连续响应。在强铁谱线发射的同时,还伴随着宽基、窄芯、双峰窄角的巴耳末谱线和强HeII谱线发射。这些谱线虽然在2005年拍摄的SDSS光谱中很强,但在2007年12月拍摄的新光谱中已经明显消失。SDSS、2 MASS、GALEX和后续GROND光度测量的比较揭示了NUV、光学和NIR波段的可变性。总的来说,这些不寻常的观测结果可以用极紫外-X射线波段的巨大爆发来解释,甚至在光学和近红外波段也能探测到。强烈而多变的铁、氦和巴耳末线代表了耀斑的“光回波”,因为它穿过了环核物质。这次爆发可能是由一个超大质量黑洞对恒星的潮汐破坏造成的。SDSS等光谱测量非常适合探测这种罕见耀斑事件的发射线光回波。这些光回波的反射映射,然后可以被用来作为一个新的和有效的探测器的物理条件在非活动或活动星系的环核物质。

英文摘要:

We report the discovery of superstrong, fading, high-ionization iron line emission in the galaxy SDSSJ095209.56+214313.3 (SDSSJ0952+2143 hereafter), which must have been caused by an X-ray outburst of large amplitude. SDSSJ0952+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 HeII emission. These lines, while strong in the SDSS spectrum taken in 2005, have faded away significantly in new spectra taken in December 2007. 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 non-active or active galaxies.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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