Signature of gravitational wave radiation in afterglows of short gamma-ray bursts?
Signature of gravitational wave radiation in afterglows of short gamma-ray bursts?
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DOI：
10.1103/physrevd.88.067304
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发表时间：
2013-02
影响因子：
5
通讯作者：
Yizhong Fan;Xuefeng Wu;D. Wei
中科院分区：
文献类型：
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作者：
Yizhong Fan;Xuefeng Wu;D. Wei
短伽马射线暴 (GRB) 是伽马射线的短暂强烈发射，其特征是持续时间短于 2 秒，似乎由双中子星合并提供动力，被认为是强引力波辐射 (GWR) 源。在像先进的 LIGO 这样的探测器出现之前，这种推测的检验被认为是不可能的。最近，越来越多的证据表明，双中子星合并过程中形成了高度磁化的中子星（即磁星）。在这项工作中，我们重新审视了对超质量磁星模型中一些短GRB余辉中检测到的X射线平台的解释，发现非旋转中子星的最大引力质量类似于2.3M（圆点），并且观测到的一些X射线平台的持续时间明显短于磁偶极子辐射场景中预期的持续时间，这表明X射线平台的崩溃 超质量磁星因 GWR 的能量损失而大大增强。这一结果表明，GWR 的特征可能已经存在于当前短伽马暴的电磁数据中。
Short gamma-ray bursts (GRBs), brief intense emission of gamma rays characterized by a duration shorter than 2 s that are plausibly powered by the coalescence of binary neutron stars, are believed to be strong gravitational wave radiation (GWR) sources. The test of such a speculation has been thought to be impossible until the performance of the detectors like advanced LIGO. Recently there has been growing evidence for the formation of a highly magnetized neutron star (i.e., magnetar) in the double neutron star mergers. In this work we reexamine the interpretation of the x-ray plateau followed by an abrupt decline detected in some short GRB afterglows within the supramassive magnetar model and find that the maximum gravitational mass of the nonrotating neutron stars is similar to 2.3M(circle dot) and the observed duration of some x-ray plateaus are significantly shorter than that expected in the magnetic dipole radiation scenario, suggesting that the collapse of the supramassive magnetars has been considerably enhanced by the energy loss via GWR. Such a result demonstrates that the signature of GWR may have already existed in current electromagnetic data of short GRBs.