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Gravitational wave recoil oscillations of black holes: implications for unified models of active galactic nuclei

机译:黑洞的引力波反冲振荡:对活动星系核的统一模型的影响

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摘要

We consider the consequences of gravitational wave recoil for unified models of active galactic nuclei (AGNs). Spatial oscillations of supermassive black holes (SMBHs) around the cores of galaxies following gravitational wave (GW) recoil imply that the SMBHs spend a significant fraction of time off-nucleus, at scales beyond that of the molecular obscuring torus. Assuming reasonable distributions of recoil velocities, we compute the off-core timescale of (intrinsically type-2) quasars. We find that roughly one-half of major mergers result in a SMBH being displaced beyond the torus for a time of 107.5 yr or more, comparable to quasar activity timescales. Since major mergers are most strongly affected by GW recoil, our results imply a deficiency of type 2 quasars in comparison to Seyfert 2 galaxies. Other consequences of the recoil oscillations for the observable properties of AGNs are also discussed.
机译:我们考虑了重力波反冲对活动星系核(AGNs)统一模型的影响。引力波(GW)后座力作用后,围绕星系核心的超大质量黑洞(SMBH)的空间振荡表明,SMBH花费了大量的非核时间,其规模超出了分子遮盖环面的范围。假设反冲速度的合理分布,我们计算(本质上为2型)类星体的离核时间尺度。我们发现,大约有一半的重大合并导致SMBH在107.5年或更长时间的时间里流离了圆环面,这与类星体活动的时间尺度相当。由于大型合并受到GW反冲的影响最大,因此我们的结果表明与Seyfert 2星系相比2型类星体缺乏。还讨论了反冲振荡对AGN的可观察特性的其他影响。

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