论文标题
黑洞合并通过Exection共振
Blackhole Mergers Through Evection Resonances
论文作者
论文摘要
已经提出了提高恒星质量黑洞二进制合并速率的机制，例如von Zeipel-Lidov-Kozai机制（VZLK）。但是，为了极大地激发偏心率并减少通过VZLK的合并时间，需要高倾斜。在这里，我们提出了一种新颖的途径，由于偏心率的增加，包括在几乎连环构型中，紧凑型二进制文件可以合并。具体而言，当二进制的进动速率等于超级质量黑洞周围的轨道周期时，可以在Exection共振中捕获紧凑的二进制二元迁移。在我们的研究中，我们包括牛顿后牛顿后的一阶进进度，以及由于二进制的一个或两个组件所致的磁盘所致。当二进制扫描通过共振发生时，只有在时间尺度上迁移10-100倍的共鸣时间尺度时，偏心率就会感到兴奋。随着磁盘质量的增加，库时间尺度降低。二进制的偏心激发可以将合并时间尺度减少到最高$ \ sim 10^{3-5} $。
Mechanisms have been proposed to enhance the merger rate of stellar mass black hole binaries, such as the Von Zeipel-Lidov-Kozai mechanism (vZLK). However, high inclinations are required in order to greatly excite the eccentricity and to reduce the merger time through vZLK. Here, we propose a novel pathway through which compact binaries could merge due to eccentricity increase in general, including in a near coplanar configuration. Specifically, a compact binary migrating in an AGN disk could be captured in an evection resonance, when the precession rate of the binary equals their orbital period around the supermassive black hole. In our study we include precession to due first-order post Newtonian precession as well as that due to disk around one or both components of the binary. Eccentricity is excited when the binary sweeps through the resonance which happens only when it migrates on a timescale 10-100 times the libration timescale of the resonance. Libration timescale decreases as the mass of the disk increases. The eccentricity excitation of the binary can reduce the merger timescale by a factor up to $\sim 10^{3-5}$.
