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arXiv 2009.10488astro-ph.HE
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我们能用短伽马射线暴来限制中子星合并的后果吗?

Can we constrain the aftermath of binary neutron star mergers with short gamma-ray bursts?

Barbara Patricelli, Maria Grazia Bernardini

摘要:

对GW170817和GRB170817 A的联合观测证明,双星中子星(BNS)合并是短伽马射线暴(SGRB)的祖先:这在仍未稳定的SGRB中央引擎和BNS合并的结果之间建立了直接联系,其性质取决于状态方程(EOS)和中子星的质量。我们提出了一种新的方法来探测基于此链接的SGRB的中央引擎。我们产生一个扩展的目录BNS合并结合最近的理论预测BNS合并率作为红移的函数和NS质量分布推断从银河系BNS的测量。我们使用这个目录来预测BNS系统结束磁星(稳定或超大质量NS)或BH(迅速形成或超大质量NS崩溃后)为不同的EOS的数量,我们比较这些结果与观察到的SGRB率。尽管不确定性主要与知识贫乏的SGRB喷气结构,我们发现,对于大多数EOS的BNS合并后产生的磁星的速率足以为所有的SGRB供电,而只有BH作为可能的中央引擎的情况似乎是不利的。

英文摘要:

The joint observation of GW170817 and GRB170817A proved that binary neutron star (BNS) mergers are progenitors of short Gamma-ray Bursts (SGRB): this established a direct link between the still unsettled SGRB central engine and the outcome of BNS mergers, whose nature depends on the equation of state (EOS) and on the masses of the NSs. We propose a novel method to probe the central engine of SGRBs based on this link. We produce an extended catalog of BNS mergers by combining recent theoretically predicted BNS merger rate as a function of redshift and the NS mass distribution inferred from measurements of Galactic BNSs. We use this catalog to predict the number of BNS systems ending as magnetars (stable or Supramassive NS) or BHs (formed promptly or after the collapse of a hypermassive NS) for different EOSs, and we compare these outcomes with the observed rate of SGRBs. Despite the uncertainties mainly related to the poor knowledge of the SGRB jet structure, we find that for most EOSs the rate of magnetars produced after BNS mergers is sufficient to power all the SGRBs, while scenarios with only BHs as possible central engine seems to be disfavoured.

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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