论文标题
超宽黑洞 - 中子恒星二进制
Ultra wide black-hole - neutron star binaries as a possible source for gravitational waves and short gamma ray bursts
论文作者
论文摘要
Ligo/处女座/Karga合作的第三次观察报告报告了一些中子星-Black Hole（NSBH）合并事件。尽管NSBH合并尚未受到广泛的理论关注，但它们可能以短伽玛 - 射线突发的形式具有有希望的电磁特征。在这里，我们表明NSBH动态合并可以自然地从田间的超宽二进制物中形成。在这些超宽系统中，与银河系中其他邻居的Flyby重力相互作用可能会导致高偏心性，从而将二进制驱动到合并中。我们表明，此过程可能会导致$ \ sim 10 $ 〜gpc $^{ - 3} $〜yr $^{ - 1} $（$ \ sim 5 $ 〜gpc $^{ - 3} $ 〜yr $^{ - 1} $）的合并费率。该渠道预测，宿主银河系的速度分散率更高，延迟时间分布较高，比均匀但更陡的$ 1/t $，较低的BH与NS质量比的合并率更高。
The third observing run of the LIGO/Virgo/KARGA collaboration reported a few neutron star - black hole (NSBH) merger events. While NSBH mergers have yet to receive extensive theoretical attention, they may have a promising electromagnetic signature in the form of short gamma - ray bursts. Here we show that NSBH dynamical mergers can naturally form from ultra - wide binaries in the field. Flyby gravitational interactions with other neighbors in the galaxy in these ultra - wide systems may result in high eccentricity that drives the binary into a merger. We show that this process can result in a merger rate at the order of $\sim 10$~Gpc$^{-3}$~yr$^{-1}$ ($\sim 5$~Gpc$^{-3}$~yr$^{-1}$) for elliptical (spiral) galaxies. This channel predicts higher merger rate with higher velocity dispersion of the host - galaxy, delay time distribution which shallower than uniform but steeper that $1/t$, higher merger rate for lower BH to NS mass ratio.
