AGN as potential factories for eccentric black hole mergers
AGN as potential factories for eccentric black hole mergers
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DOI：
10.1038/s41586-021-04333-1
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发表时间：
2020-10
期刊：
影响因子：
64.8
通讯作者：
J. Samsing;I. Bartos;D. D’Orazio;Z. Haiman;B. Kocsis;N. Leigh;B. Liu;M. Pessah;H. Tagawa
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文献类型：
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作者：
J. Samsing;I. Bartos;D. D’Orazio;Z. Haiman;B. Kocsis;N. Leigh;B. Liu;M. Pessah;H. Tagawa
有一些微弱的证据表明，名为GW 190521的黑洞合并具有非零偏心率。此外，组成黑洞的质量超过了恒星演化预测的极限。巨大的质量可以用连续的合并来解释，这在围绕活动星系核的气体盘中可能是有效的，但是很难在合并的整个过程中保持偏心轨道，因为基础物理学会争论圆化。在这里，我们表明，活动星系核盘环境可以导致过度的偏心合并，如果单和双黑洞之间的相互作用是频繁的，并发生相互倾斜小于几度。我们进一步说明，这个偏心人口有一个不同的分布之间的倾斜度的自旋矢量的黑洞和它们的轨道角动量在合并，称为自旋轨道倾斜，与其余的圆形合并。
There is some weak evidence that the black hole merger named GW190521 had a non-zero eccentricity,. In addition, the masses of the component black holes 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, 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 active galactic nuclei 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 with the remaining circular mergers.