Symmetry Breaking in Dynamical Encounters in the Disks of Active Galactic Nuclei
Symmetry Breaking in Dynamical Encounters in the Disks of Active Galactic Nuclei
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DOI：
10.3847/2041-8213/ac400a
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发表时间：
2021-10
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影响因子：
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通讯作者：
Yihan Wang;B. McKernan;Saavik Ford;R. Perna;N. Leigh;M. M. Low-M.
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文献类型：
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作者：
Yihan Wang;B. McKernan;Saavik Ford;R. Perna;N. Leigh;M. M. Low-M.
活动星系核盘可能是双星黑洞合并的重要场所。在这里，我们表明，通过数值实验与高精度，高精度的代码SpaceHub的对称性破缺动态遇到活动星系核磁盘可以导致之间的不对称性，逆行BBH合并。硬化不对称的方向取决于初始二元半长轴。假设黑洞的自旋在短时间尺度上与星系盘的角动量一致，预测了在LIGO-Virgo探测活动星系核盘的黑洞合并过程中质量加权投影自旋χ eff的非对称分布.特别是，这个模型预测，正χ eff BBH合并是最有可能遇到的迁移陷阱中的径向距离为500-600引力半径的大质量第三系。
The disks of active galactic nuclei (AGNs) may be important sites of binary black hole (BBH) mergers. Here we show via numerical experiments with the high-accuracy, high-precision code SpaceHub that broken symmetry in dynamical encounters in AGN disks can lead to asymmetry between prograde and retrograde BBH mergers. The direction of the hardening asymmetry depends on the initial binary semimajor axis. Under the assumption that the spin of the BHs becomes aligned with the angular momentum of the disk on a short timescale compared with the encounter timescale, an asymmetric distribution of mass-weighted projected spin χ eff is predicted in LIGO–Virgo detections of BBH mergers from AGN disks. In particular, this model predicts that positive χ eff BBH mergers are most likely for encounters with massive tertiaries in migration traps at radial distances ≳500–600 gravitational radii.