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arXiv 0705.3668astro-ph
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在星系Messier 85中的一个异常辉煌的瞬间

An unusually brilliant transient in the galaxy Messier 85

S. R. Kulkarni, E. O. Ofek, A. Rau, S. B. Cenko, A. M. Soderberg, D. B. Fox, A. Gal-Yam, P. L. Capak, D. S. Moon, W. Li, A. V. Filippenko, E. Egami, J. Kartaltepe, D. B. Sanders

摘要:

从历史上看,可变和瞬态源既让天文学家感到惊讶,也为天空提供了新的视角。在这里,我们报告的光学瞬变的发现在透镜星系梅西耶85的外围的室女星系团。这一事件的峰值绝对R星等为-12,明显比新星亮,但比Ia型超新星暗(预计来自透镜星系中的老恒星群)。该区域的存档图像没有显示出在该位置有一颗发光的恒星,其上限为~-4.1,因此它不太可能是一颗发光的蓝色变星的巨大爆发。在两个月的时间里,瞬变辐射能量几乎为10 E47尔格,随后在光学天空中消失。它类似于M31星系中的一个神秘的瞬变现象,但在峰值时比它明亮6倍。M85 OT 2006 -1的一个可能来源是恒星合并。如果是这样的话,在附近星系中寻找类似的事件不仅可以研究超爱丁顿源的物理学,而且还可以探索恒星双星系统演化的一个重要阶段。

英文摘要:

Historically, variable and transient sources have both surprised astronomers and provided new views of the heavens. Here we report the discovery of an optical transient in the outskirts of the lenticular galaxy Messier 85 in the Virgo Cluster. With a peak absolute R magnitude of -12 this event is distinctly brighter than novae, but fainter than type Ia supernovae (expected from a population of old stars in lenticular galaxies). Archival images of the field do not show a luminous star at that position with an upper limit of ~-4.1, so it is unlikely to be a giant eruption from a luminous blue variable star. Over a two month period the transient emitted radiation energy of almost 10E47 erg and subsequently faded in the opical sky. It is similar to, but more luminous at peak by a factor of 6 than, an enigmatic transient in the galaxy M31. A possible origin of M85 OT2006-1 is a stellar merger. If so, searches for similar events in nearby galaxies will not only allow to study the physics of hyper-Eddington sources, but also probe an important phase in the evolution of stellar binary systems.

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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