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arXiv 1006.0487astro-ph.HEastro-ph.CO
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发现低红移短GRB 080905 A的余辉和宿主星系

Discovery of the afterglow and host galaxy of the low redshift short GRB 080905A

A. Rowlinson, K. Wiersema, A. J. Levan, N. R. Tanvir, P. T. O'Brien, E. Rol, J. Hjorth, C. C. Thone, A. de Ugarte Postigo, J. P. U. Fynbo, P. Jakobsson, C. Pagani, M. Stamatikos

摘要:

我们介绍了短GRB 080905 A的发现、其光学余辉和宿主星系。最初由Swift发现,我们的深层光学观测使我们能够识别出一个微弱的光学余辉,随后是一个位于GRB位置下方的正面螺旋宿主星系,其机会对齐概率<1%。在余辉中没有超新星成分存在到深极限。星系的光谱提供了z=0.1218的红移,这是迄今为止观测到的短伽玛射线暴的最低红移。伽玛暴位于距主星系中心约18.5千秒差距的北旋臂上,北旋臂上的恒星星族比南旋臂老。在爆发位置的正下方没有可见的发射线,这意味着在爆发位置几乎没有正在形成的恒星。如果GRB 080905A的前身是一个紧凑的双星并合,那么这些性质自然可以得到解释。

英文摘要:

We present the discovery of short GRB 080905A, its optical afterglow and host galaxy. Initially discovered by Swift, our deep optical observations enabled the identification of a faint optical afterglow, and subsequently a face-on spiral host galaxy underlying the GRB position, with a chance alignment probability of <1%. There is no supernova component present in the afterglow to deep limits. Spectroscopy of the galaxy provides a redshift of z=0.1218, the lowest redshift yet observed for a short GRB. The GRB lies offset from the host galaxy centre by ~18.5 kpc, in the northern spiral arm which exhibits an older stellar population than the southern arm. No emission lines are visible directly under the burst position, implying little ongoing star formation at the burst location. These properties would naturally be explained were the progenitor of GRB 080905A a compact binary merger.

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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