arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1709.01468astro-ph.HEastro-ph.COgr-qc
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来自短伽马射线暴茧的离轴瞬发X射线瞬变

Off-axis prompt X-ray transients from the cocoon of short gamma-ray bursts

Davide Lazzati, Diego Lopez-Camara, Matteo Cantiello, Brian J. Morsony, Rosalba Perna, Jared C. Workman

摘要:

本文给出了短持续时间伽马射线暴瞬发辐射的数值模拟结果。我们考虑从相对论性喷流,温和的相对论性茧,和非相对论性冲击周围的材料的发射。我们发现,茧材料被限制在离轴角15<θ <45度之间,并产生持续时间为几秒至~10秒的X射线瞬变,从合并的时间延迟几秒。我们还讨论了这种瞬态可以被检测到的距离,发现它敏感地依赖于关于辐射光谱的假设。质子热茧瞬变只能探测到几兆秒差距,而康普顿化瞬变可以由费米GBM探测到几十兆秒差距。

英文摘要:

We present the results of numerical simulations of the prompt emission of short-duration gamma-ray bursts. We consider emission from the relativistic jet, the mildly relativistic cocoon, and the non-relativistic shocked ambient material. We find that the cocoon material is confined between off-axis angles 15<theta<45 degrees and gives origin to X-ray transients with a duration of a few to ~10 seconds, delayed by a few seconds from the time of the merger. We also discuss the distance at which such transients can be detected, finding that it depends sensitively on the assumptions that are made about the radiation spectrum. Purely thermal cocoon transients are detectable only out to a few Mpc, Comptonized transients can instead be detected by the FERMI GBM out to several tens of Mpc.

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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