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arXiv 1302.4878astro-ph.HE
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GRB 121027 A中的巨大X射线凸点:后退盘吸积的证据

Giant X-ray Bump in GRB 121027A: Evidence for Fall-back Disk Accretion

Xue-Feng Wu, Shu-Jin Hou, Wei-Hua Lei

摘要:

在GRB 121027 A的观测中,一个特别有趣的发现是斯威夫特/X射线望远镜探测到的巨大X射线隆起。X射线余辉在触发后约1000 s时急剧再亮,在不到200 s的时间内亮度增加了两个数量级以上。这种X射线的冲击持续超过10千秒。它与典型的X射线耀斑有很大的不同。在这封信中,我们提出了一个回退吸积模型来解释这种X射线碰撞的背景下,长期的伽马射线暴的大质量恒星的崩溃。所需的后退半径约为3.5e10 cm,质量约为0.9-2.6太阳质量,这意味着在GRB 121027 A的大质量祖先的最后阶段,氦包层的很大一部分应该会在质量损失中幸存下来。

英文摘要:

A particularly interesting discovery in observations of GRB 121027A is that of a giant X-ray bump detected by the Swift/X-Ray Telescope. The X-ray afterglow re-brightens sharply at about 1000 s after the trigger by more than two orders of magnitude in less than 200 s. This X-ray bump lasts for more than 10 ks. It is quite different from typical X-ray flares. In this Letter we propose a fall-back accretion model to interpret this X-ray bump within the context of the collapse of a massive star for a long-duration gamma-ray burst. The required fall-back radius of about 3.5e10 cm and mass of about 0.9-2.6 solar masses imply that a significant part of the helium envelope should survive through the mass loss during the last stage of the massive progenitor of GRB 121027A.

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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