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arXiv 1301.0629astro-ph.HE
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短GRB光变曲线中磁星中心发动机的特征

Signatures of magnetar central engines in short GRB lightcurves

A. Rowlinson, P. T. O'Brien, B. D. Metzger, N. R. Tanvir, A. J. Levan

摘要:

雨燕样本中的长伽马射线暴(LGRB)中有相当一部分有一个平台期,显示出持续能量注入的证据。我们认为雨燕卫星探测到的许多短伽马射线暴(SGRB)也显示出能量注入的证据。在典型的SGRB祖细胞模型中解释这一观察结果是具有挑战性的,因为通常用于解释LGRB中的平台期的晚期吸积很可能不存在于SGRB群体中。另外,据预测,NS-NS合并的残余可能不会立即坍缩成BH(甚至根本不会坍缩),而是形成一颗不稳定的毫秒脉冲星(磁星),为X射线光变曲线中的平台阶段提供动力。通过将磁星模型拟合到2012年5月之前观测到的所有Swift SGRB,我们发现大约一半可以清楚地拟合磁星平台阶段,而其余的则与形成磁星相一致,但数据不足以证明平台阶段。需要更多的早期数据和更大的样本来证实这一点。该模型可以通过使用下一代引力波观测站检测事件的引力波发射来检验。

英文摘要:

A significant fraction of the Long Gamma-ray Bursts (LGRBs) in the Swift sample have a plateau phase showing evidence of ongoing energy injection. We suggest that many Short Gamma-ray Bursts (SGRBs) detected by the Swift satellite also show evidence of energy injection. Explaining this observation within the typical SGRB progenitor model is challenging as late time accretion, often used to explain plateaus in LGRBs, is likely to be absent from the SGRB population. Alternatively, it is predicted that the remnant of NS-NS mergers may not collapse immediately to a BH (or even collapse at all), forming instead an unstable millisecond pulsar (magnetar) which powers a plateau phase in the X-ray lightcurve. By fitting the magnetar model to all of the Swift SGRBs observed until May 2012, we find that about half can be clearly fitted with a magnetar plateau phase while the rest are consistent with forming a magnetar but the data are insufficient to prove a plateau phase. More data, both at early times and a larger sample, are required to confirm this. This model can be tested by detecting the gravitational wave emission from events using the next generation gravitational wave observatories.

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