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arXiv 1302.2352astro-ph.HE
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一个新的超长持续时间伽马射线暴群

A new population of ultra-long duration gamma-ray bursts

A. J. Levan, N. R. Tanvir, R. L. C. Starling, K. Wiersema, K. L. Page, D. A. Perley, S. Schulze, G. A. Wynn, R. Chornock, J. Hjorth, S. B. Cenko, A. S. Fruchter… 展开作者

A. J. Levan, N. R. Tanvir, R. L. C. Starling, K. Wiersema, K. L. Page, D. A. Perley, S. Schulze, G. A. Wynn, R. Chornock, J. Hjorth, S. B. Cenko, A. S. Fruchter, P. T. O'Brien, G. C. Brown, R. L. Tunnicliffe, D. Malesani, P. Jakobsson, D. Watson, E. Berger, D. Bersier, B. E. Cobb, S. Covino, A. Cucchiara, A. de Ugarte Postigo, D. B. Fox, A. Gal-Yam, P. Goldoni, J. Gorosabel, L. Kaper, T. Kruehler, R. Karjalainen, J. P. Osborne, E. Pian, R. Sanchez-Ramirez, B. Schmidt, I. Skillen, G. Tagliaferri, C. Thone, O. Vaduvescu, R. A. M. J. Wijers, B. A. Zauderer

摘要:

我们提出了全面的多波长观测的三个伽马射线暴(GRB)的持续时间为几千秒。我们证明了这些事件是河外瞬变,特别是我们解决了GRB 101225 A(“圣诞节爆发”)的距离的长期难题,发现它有一个红移z=0.847,并显示两个明显相似的事件(GRB 111209 A和GRB 121027 A)分别位于z=0.677和z=1.773。这些系统显示出极不寻常的X射线和光学光变曲线,与经典的伽玛暴非常不同,具有持久的高度可变的X射线发射和光学光变曲线,与X射线中看到的行为几乎没有相关性。它们的宿主星系是暗淡、紧凑、高度恒星形成的矮星系,是典型的“蓝色紧凑星系”。我们认为,这些爆发是迄今为止在很大程度上未被认识到的超长GRB人口的原型,虽然观测上难以检测可能是天体物理学相对常见的。长的持续时间可以自然地解释为引擎驱动的恒星爆炸的半径比通常认为的伽玛暴祖先大得多,伽玛暴祖先被认为具有紧凑的沃尔夫-拉叶祖先星。然而,我们无法在它们的光变曲线或光谱中明确地识别超新星的特征。我们还考虑了另一种可能性,即它们是由超大质量黑洞对恒星的潮汐破坏引起的。

英文摘要:

We present comprehensive multiwavelength observations of three gamma-ray bursts (GRBs) with durations of several thousand seconds. We demonstrate that these events are extragalactic transients; in particular we resolve the long-standing conundrum of the distance of GRB 101225A (the "Christmas-day burst"), finding it to have a redshift z=0.847, and showing that two apparently similar events (GRB 111209A and GRB 121027A) lie at z=0.677 and z=1.773 respectively. The systems show extremely unusual X-ray and optical lightcurves, very different from classical GRBs, with long lasting highly variable X-ray emission and optical light curves that exhibit little correlation with the behaviour seen in the X-ray. Their host galaxies are faint, compact, and highly star forming dwarf galaxies, typical of "blue compact galaxies". We propose that these bursts are the prototypes of a hitherto largely unrecognized population of ultra-long GRBs, that while observationally difficult to detect may be astrophysically relatively common. The long durations may naturally be explained by the engine driven explosions of stars of much larger radii than normally considered for GRB progenitors which are thought to have compact Wolf-Rayet progenitor stars. However, we cannot unambiguously identify supernova signatures within their light curves or spectra. We also consider the alternative possibility that they arise from the tidal disruption of stars by supermassive black holes.

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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