论文标题
AGN作为偏心黑洞合并的潜在工厂
AGN as Potential Factories for Eccentric Black Hole Mergers
论文作者
论文摘要
有弱证明，名为GW190521的黑洞合并具有非零偏心率。此外，成分黑洞的质量超过了恒星进化预测的极限。可以通过连续的合并来解释大型质量，这些合并可能在活性银河核（AGN）周围的气盘中有效，但是很难一直保持偏心轨道一直与合并，因为基本物理学会争辩循环。在这里，我们表明，如果单次黑洞和二进制黑洞之间的相互作用频繁发生，并且相互倾向的发生率较小，则AGN磁盘环境可能导致过量的偏心合并。我们进一步说明，与其余的圆形合并相比，这种偏心群体在合并时的旋转矢量与它们的轨道角动量之间具有不同的倾斜度分布，被称为自旋轨道倾斜。
There is some weak evidence that the black hole merger named GW190521 had a non-zero eccentricity. In addition, the component black holes' masses exceeded the limit predicted by stellar evolution. The large masses can be explained by successive mergers, which may be efficient in gas disks surrounding active galactic nuclei (AGN), but it is difficult to maintain an eccentric orbit all the way to the merger, as basic physics would argue for circularization. Here we show that AGN-disk environments can lead to an excess of eccentric mergers, if the interactions between single and binary black holes are frequent, and occur with mutual inclinations of less than a few degrees. We further illustrate that this eccentric population has a different distribution of the inclination between the spin vectors of the black holes and their orbital angular momentum at merger, referred to as the spin-orbit tilt, compared to the remaining circular mergers.
