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arXiv 1709.01660astro-ph.HE
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双引力波并合

Double Gravitational Wave Mergers

Johan Samsing, Teva Ilan

摘要:

在本文中,我们研究的动力学结果,其中黑洞(BH)的二元单相互作用导致两个连续的引力波(GW)合并,我们称之为“双GW合并”的情况。第一GW合并通过两体GW捕获在三体交互期间发生,其中第二GW合并在第一GW合并中形成的BH与剩余的绑定的单个BH之间。我们估计的概率,观察两个GW合并,并只观察第二次合并,我们称之为“即时第二代(2G)合并”。我们发现,观察两个GW合并的概率是唯一值得注意的低GW踢($\lesssim 10^{1}-10^{2}$公里$^{-1}$),这表明,双GW合并可用于探测环境促进这种相互作用的共面相互作用。对于各向同性的遭遇,例如在球状星团中发现的遭遇,2G合并形成的概率仅为百分比水平,这表明第二代合并最有可能发生在至少交换过一次伙伴的黑洞之间。

英文摘要:

In this paper we study the dynamical outcome in which black hole (BH) binary-single interactions lead to two successive gravitational wave (GW) mergers; a scenario we refer to as a `double GW merger'. The first GW merger happens during the three-body interaction through a two-body GW capture, where the second GW merger is between the BH formed in the first GW merger and the remaining bound single BH. We estimate the probability for observing both GW mergers, and for observing only the second merger that we refer to as a `prompt second-generation (2G) merger'. We find that the probability for observing both GW mergers is only notable for co-planar interactions with low GW kicks ($\lesssim 10^{1}-10^{2}$ kms$^{-1}$), which suggests that double GW mergers can be used to probe environments facilitating such interactions. For isotropic encounters, such as the one found in globular clusters, the probability for prompt 2G mergers to form is only at the percent level, suggesting that second-generation mergers are most likely to be between BHs which have swapped partners at least once.

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