Supermassive black holes in merger-free galaxies have higher spins which are preferentially aligned with their host galaxy
Supermassive black holes in merger-free galaxies have higher spins which are preferentially aligned with their host galaxy
复制标题
无合并星系中的超大质量黑洞具有更高的自旋，优先与其宿主星系对齐
DOI：
10.1093/mnras/stad1795
复制
发表时间：
2023
影响因子：
4.8
通讯作者：
Beckmann R
中科院分区：
文献类型：
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作者：
Beckmann R
在这里，我们使用地平线活动星系核(AGN)模拟来测试无合并星系中的超大质量黑洞(SMBH)的自转是否更高。我们使用观测激励的膨胀与总质量的比率<；0.1，以及两个模拟激励的阈值来选择样本，选择自z=2以来没有经历星系合并的星系，以及那些由于SMBH合并而具有其质量的SMBH。与其他人群相比，我们在所有三个样本中都发现了更高的自旋(>；5σ)。此外，我们发现，在星系合并之后由黑洞合并主导增长的SMBH，与那些在没有星系合并的情况下通过吸积增长的SMBH相比，不太可能与其星系自转保持一致(3.4σ)。我们讨论了这对活动星系核反馈的影响，发现无合并的SMBH在无线电反馈模式下平均花费其寿命的91% (对于合并占主导的星系88% )。考虑到以前的观测和理论工作已经得出结论，无合并过程主导着SMBH-星系的共同进化，我们的结果表明这种共同进化可能受到射电模式活动星系核反馈的调节。
Here, we use the Horizon–active galactic nucleus (AGN) simulation to test whether the spins of supermassive black hole (SMBH) 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 sincez= 2, and those SMBHs withof their mass due to SMBH mergers. We find higher spins (>5σ) in all three sample 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 nucleus (AGN) feedback, finding that merger-free SMBHs spend on average 91 per cent of their lifetimes sincez= 2 in a radio mode of feedback (88 per cent 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.