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arXiv 2108.06986astro-ph.HE
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合并致密双星中中子星的布居特性

Population properties of neutron stars in the coalescing compact binaries

Yin-Jie Li, Shao-Peng Tang, Yuan-Zhu Wang, Qiang Yuan, Yi-Zhong Fan, Da-Ming Wei

摘要:

我们进行了一个层次的贝叶斯推断,以调查合并的致密双星涉及至少一个中子星(NS)的人口性质。根据目前的观测数据,我们不能排除双高斯、单高斯和均匀NS质量分布模型中的任何一种,尽管银河系NS的质量分布略倾向于引力波(GW)观测。发现中子星-黑洞(NSBH)中黑洞的质量分布与银河系X射线双星中的黑洞质量分布相似。此外,NSBH和BNS之间的合并率密度之比估计约为3:7。双星的自旋性质,虽然约束相对较差,但在重建NS和BH的质量分布中起着重要的作用。我们发现,一个完美的对齐自旋分布可以排除,而一个纯粹的各向同性分布的自旋取向仍然是允许的。

英文摘要:

We perform a hierarchical Bayesian inference to investigate the population properties of the coalescing compact binaries involving at least one neutron star (NS). With the current observation data, we can not rule out either of the Double Gaussian, Single Gaussian and Uniform NS mass distribution models, although the mass distribution of the Galactic NSs is slightly preferred by the gravitational wave (GW) observations. The mass distribution of black holes (BHs) in the neutron star-black hole (NSBH) population is found to be similar to that for the Galactic X-ray binaries. Additionally, the ratio of the merger rate densities between NSBHs and BNSs is estimated to be about 3 : 7. The spin properties of the binaries, though constrained relatively poor, play nontrivial role in reconstructing the mass distribution of NSs and BHs. We find that a perfectly aligned spin distribution can be ruled out, while a purely isotropic distribution of spin orientation is still allowed.

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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