论文标题
紧凑型超质量黑洞二进制的潮汐破坏事件
Tidal Disruption Events by Compact Supermassive Black Hole Binaries
论文作者
论文摘要
可以通过超级质量的黑洞二进制文件潮汐破坏或吞噬星星。使用大量准确的少体模拟，我们研究了用硬质量的黑洞二进制文件对全面和部分中断和直接捕获事件的增强和抑制，其主要参数范围很大，即主黑孔质量（$ 10^{5} {5} -10^{5} -10^{8} {8} M_ {8} M _ {\ odot} $ { （$ 10^{ - 3} -1 $），二进制半轴轴与硬质半径的比率（$ 10^{ - 4} -1 $），二进制偏心度（$ 0.0-0.9 $）和恒星质量（$ 0.0-0.9 $）（$ 0.3-3-3-3-3-3亿_ {\ odot} $）。与以前的工作相比，这是参数空间的显着扩展。我们表明，所有三个事件的遭遇概率均由“遭遇横截面”很好地描述，该横截面与候选人距离成正比。相对于单个黑洞，根据二进制参数，超级质量黑洞二进制文件的完全干扰可能会增加40-50美元的倍数或抑制$ 10 $。相对论效应对于主要黑洞质量$ \ leq 10^{7} m _ {\ odot} $并不重要，但可以为高级黑洞质量提供全部破坏概率的额外增强。我们提供了一个适合全部破坏概率的拟合公式，而硬质黑洞二进制文件适用于广泛的参数。我们还发现，部分破坏事件可能发生多次，然后在完全中断或直接捕获之前发生，并且它们的概率可能大于完全破坏事件的概率。由于部分破坏事件可以诱发恒星旋转，质量损失并改变轨道，因此它可能会显着影响整个全面破坏事件发生率和光曲线的形状。
Stars can be tidally destroyed or swallowed by supermassive black hole binaries. Using a large number of accurate few-body simulations, we investigate the enhancement and suppression of full and partial disruption and direct capture events by hard supermassive black hole binaries with a wide ranges of key parameters, i.e., the primary black hole mass ($10^{5}-10^{8}M_{\odot}$), the binary mass ratio ($10^{-3}-1$), the ratio of the binary semimajor axis to the hardening radius ($10^{-4}-1$), the binary eccentricity ($0.0-0.9$) and the stellar mass ($0.3-3M_{\odot}$). This is a significant extension of the parameter space compared to previous work. We show that the encounter probabilities of all three events are well-described by the encounter cross section, which is proportional to the pericenter distance. The probability of full disruptions by supermassive black hole binaries can be enhanced by up to a factor of $40-50$ or suppressed by up to a factor of $10$, relative to that by single black holes, depending on the binary parameters. Relativistic effects are not important for the primary black hole mass $\leq 10^{7}M_{\odot}$, but can provide an additional enhancement of the full disruption probability by less than a factor of $2-3$ for higher primary black hole masses. We provide a fitting formula for the full disruption probability by the hard supermassive black hole binaries that works for a wide range of parameters. We also find that partial disruption events can occur multiple times before full disruptions or direct captures, and their probabilities can be greater than that of full disruption events by a factor of three. Because partial disruption events can induce stellar spins and mass loss and change the orbits, it can significantly affect the overall full disruption event rate and the shape of the light curves.
