论文标题
将核簇轨道与活跃的银河核积聚盘对齐
Aligning Nuclear Cluster Orbits with an Active Galactic Nucleus Accretion Disk
论文作者
论文摘要
活跃的银河核（AGN）由气体磁盘上积到超大质量黑洞（SMBH）提供动力。在核星簇（NSC）中旋转SMBH的恒星和恒星残留物将与AGN磁盘相互作用。在磁盘上掉落的轨道体会经历阻力力，并且通过反复的通道可以将其轨道捕获到磁盘上。 AGN磁盘中的嵌入物体人群可能是二进制黑洞合并，超新星，潮汐破坏事件和嵌入伽马射线爆发的重要来源。对于两个代表性的AGN磁盘模型，我们使用几何阻力和Bondi-Hoyle-Littleton阻力来确定捕获恒星和恒星残留物的时间。我们假设针对圆形开普勒轨道轨道器的一系列初始倾斜角度和半高轴。捕获时间在很大程度上取决于所选磁盘模型的密度和纵横比，恒星对象相对于磁盘的相对速度以及AGN寿命。我们希望，对于AGN磁盘密度$ρ\ gtrsim 10^{ - 11} \ rm g/cm^3 $和磁盘寿命$ \ geq 1 $ myr，可以在Ligo-virgo and lisa和Ligo-virgo and lisa和Ligo-virgo and lisa和Ligo-virgo and lisa和Ligo-virgo and lisa和Lisa和Lisa和Lisa和Lisa和Ligo-virgo和Lisa中发现大量嵌入式恒星对象。
Active galactic nuclei (AGN) are powered by the accretion of disks of gas onto supermassive black holes (SMBHs). Stars and stellar remnants orbiting the SMBH in the nuclear star cluster (NSC) will interact with the AGN disk. Orbiters plunging through the disk experience a drag force and, through repeated passage, can have their orbits captured by the disk. A population of embedded objects in AGN disks may be a significant source of binary black hole mergers, supernovae, tidal disruption events and embedded gamma-ray bursts. For two representative AGN disk models we use geometric drag and Bondi-Hoyle-Littleton drag to determine the time to capture for stars and stellar remnants. We assume a range of initial inclination angles and semi-major axes for circular Keplerian prograde orbiters. Capture time strongly depends on the density and aspect ratio of the chosen disk model, the relative velocity of the stellar object with respect to the disk, and the AGN lifetime. We expect that for an AGN disk density $ρ\gtrsim 10^{-11}\rm g/cm^3$ and disk lifetime $\geq 1$Myr, there is a significant population of embedded stellar objects, which can fuel mergers detectable in gravitational waves with LIGO-Virgo and LISA.
