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arXiv 1606.03043astro-ph.HE
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来自短伽马射线暴观测的中子星合并的双重星群证据

Evidence for a dual population of neutron star mergers from short Gamma-Ray Burst observations

K. Siellez, M. Boer, B. Gendre, T. Regimbau

摘要:

短持续时间的伽马射线暴被认为起源于双星系统中中子星的合并。它们被检测为短暂的($<$ 2秒),强烈的伽马射线辐射闪光,随后是较弱的,迅速减少的余辉。当它们的灵敏度足够低时,它们有望被先进的LIGO和Virgo探测到。在最近的一项研究中,我们发现了一群短伽马射线暴,它们本质上是微弱的,而且就在附近。在这里,我们提供的证据,有利于存在这种新的人口,很难复制与场中子星二元聚结模型。我们认为这些系统可能是球状星团中动态产生的,并且可能是黑洞和中子星合并的结果。先进的LIGO和Virgo观测到了与球状星团动力学形成相一致的高速率NSBH合并,这将证实这一假设,并将有助于推导出球状星团内黑洞的质量函数,以及微弱短伽玛暴的光度函数。

英文摘要:

Short duration Gamma-Ray Bursts are thought to originate from the coalescence of neutron stars in binary systems. They are detected as a brief ($<$ 2s), intense flash of gamma-ray radiation followed by a weaker, rapidly decreasing afterglow. They are expected to be detected by Advanced LIGO and Virgo when their sensitivity will be low enough. In a recent study we identified a population of short Gamma-Ray Bursts that are intrinsically faint and nearby. Here we provide evidence in favor of the existence of this new population that can hardly be reproduced with a model of field neutron star binary coalescences. We propose that these systems may be produced dynamically in globular clusters, and may result from the merger of a black hole and a neutron star. The advanced LIGO and Virgo observation of a high rate of NSBH mergers compatible with the dynamical formation in globular clusters would be a confirmation of this hypothesis and would enable for the derivation of the mass function of black holes inside globular clusters, as well as the luminosity function of faint short GRBs.

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