论文标题
无合并星系中的超质量黑洞具有较高的旋转，优先与宿主星系保持一致
Supermassive black holes in merger-free galaxies have higher spins which are preferentially aligned with their host galaxy
论文作者
论文摘要
在这里，我们使用Horizon-AGN模拟测试无合并星系中SMBH的旋转是否更高。我们使用<0.1的观察动机的凸起与总质量比选择样品，以及两个自从z = 2以来没有经过星系合并的星系的模拟动机阈值，以及由于SMBH合并而导致的质量<10％的SMBH。与其他人群相比，我们发现所有三个样品中的旋转较高（>5σ）。此外，我们发现，与没有星系合并（3.4σ）的那些在没有促销中成长的SMBH，其生长以BH合并为主导的SMBH与它们的星系自旋相比，其与星系自旋的可能性较小（3.4σ）。我们讨论了这对主动银河核（AGN）反馈的影响的影响，发现自从Z = 2以来，在无线电模式下，无合并的SMBH平均花费了其寿命的91％（合并为主导的星系为88％）。鉴于先前的观察和理论工作得出的结论是，无合并过程主导了SMBH-Galaxy共同进化，我们的结果表明，这种共同进化可以通过无线电模式AGN反馈来调节。
Here we use the Horizon-AGN simulation to test whether the spins of SMBHs in merger-free galaxies are higher. We select samples using an observationally motivated bulge-to-total mass ratio of < 0.1, along with two simulation motivated thresholds selecting galaxies which have not undergone a galaxy merger since z = 2, and those SMBHs with < 10% of their mass due to SMBH mergers. We find higher spins (> 5σ ) in all three samples compared to the rest of the population. In addition, we find that SMBHs with their growth dominated by BH mergers following galaxy mergers, are less likely to be aligned with their galaxy spin than those that have grown through accretion in the absence of galaxy mergers (3.4σ ). We discuss the implications this has for the impact of active galactic nuclei (AGN) feedback, finding that merger-free SMBHs spend on average 91% of their lifetimes since z = 2 in a radio mode of feedback (88% for merger-dominated galaxies). Given that previous observational and theoretical works have concluded that merger-free processes dominate SMBH-galaxy co-evolution, our results suggest that this co-evolution could be regulated by radio mode AGN feedback.
