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arXiv 1911.04495astro-ph.HE
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宽层次四重系统引力波并合事件中质量隙黑洞的形成与合并

Formation and merging of Mass Gap Black Holes in Gravitational Wave Merger Events from Wide Hierarchical Quadruple Systems

Mohammadtaher Safarzadeh, Adrian S. Hamers, Abraham Loeb, Edo Berger

摘要:

我们调查长期演化的分级四重系统作为一个形成通道的质量间隙黑洞(与质量约$3-5$ $M_{\odot}$)的系统,最终将导致双黑洞合并可检测的地面引力波探测器(LIGO/室女座)。我们发现,在一个3+1的分级系统中,两个事件的诱导合并将首先导致两个中子星合并,并形成一个质量隙黑洞,随后将合并与另一个(更大的)黑洞通过第二次诱导合并。我们证明,这样的系统是稳定的飞掠,它们的形成将预测一个高质量比和偏心合并的质量间隙黑洞与一个更大质量的黑洞同伴。这样的形成通道可以解释观测到的引力波事件,例如最近发现的LIGO/Virgo事件S190814 bv和S190924 h。

英文摘要:

We investigate secular evolution in hierarchical quadruple systems as a formation channel of mass-gap black holes (with masses of about $3-5$ $M_{\odot}$) in systems that will eventually lead to binary black hole mergers detectable by ground-based gravitational wave detectors (LIGO/Virgo). We show that in a 3+1 hierarchical system, two episodes of induced mergers would first cause two neutron stars to merge and form a mass-gap black hole, which will subsequently merge with another (more massive) black hole through a second induced merger. We demonstrate that such systems are stable to flybys, and their formation would predict a high mass ratio and eccentric merger of a mass-gap black hole with a more massive black hole companion. Such a formation channel may explain observed gravitational wave events such as the recently-discovered LIGO/Virgo events S190814bv and S190924h.

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