论文标题
AGN磁盘中的黑洞，中子星和白矮人合并率
Black hole, neutron star and white dwarf merger rates in AGN disks
论文作者
论文摘要
高级Ligo \＆Advanced处女座正在检测大量二进制恒星原点黑洞（BH）合并。加速BH合并的有前途的通道在于超级质量黑洞周围气体的活跃银河核（AGN）磁盘。在这里，我们通过蒙特卡洛模拟研究了AGN磁盘模型中紧凑型物体合并的相对数量。我们发现批量磁盘中的所有合并类型的数量生长了$ \ propto t^{1/3} $，这是由更大的合并组件的山坡驱动的。 AGN磁盘中NS-BH合并的中值质量比为$ \ tilde {q} = 0.07 \ pm 0.06（0.14 \ pm 0.07）$的质量功能（MF）$ M^{ - 1（ - 1（2）} $。如果一个观察到的BH-BH合并率的$ f_ {agn} $（$ {\ cal} {r} {r} _ {bh-bh} $）来自AGN，我们期望来自$ {\ cal} sim agn通道的NS-BH（NS-NS）合并的速率f_ {agn} [10,300] \ rm {gpc}^{ - 3} \ rm {yr}^{ - 1} $，（$ {\ cal} {r} {r} _ {ns-ns} \ rm {yr}^{ - 1} $）。从初步的O3结果来看，允许NS-NS/BH-BH LIGO搜索量的比率，我们可以排除AGN通道作为对观察到的NS-NS合并的主要贡献。该通道中较低的质量间隙事件的数量是核MF和质量分离效率的强大功能。从Ligo得出的紧凑型物体合并比率可以限制嵌入AGN磁盘中的MF，质量分离和种群的模型。 $ z <1 $的AGN磁盘中NS-BH合并的EM对应数为$ \ sim [30,900] {\ rm {yr}}}^{ - 1}（f_ {agn} /0.1）$。在大型AGN调查中，由于嵌入式事件而引起的EM搜索将补充AGN模型的LIGO限制和必须居住在其中的嵌入式种群。
Advanced LIGO \& Advanced Virgo are detecting a large number of binary stellar origin black hole (BH) mergers. A promising channel for accelerated BH merger lies in active galactic nucleus (AGN) disks of gas around super-masssive black holes. Here we investigate the relative number of compact object mergers in AGN disk models, including BH, neutron stars (NS) and white dwarfs, via Monte Carlo simulations. We find the number of all merger types in the bulk disk grows $\propto t^{1/3}$ which is driven by the Hill sphere of the more massive merger component. Median mass ratios of NS-BH mergers in AGN disks are $\tilde{q}=0.07\pm 0.06(0.14\pm 0.07)$ for mass functions (MF) $M^{-1(-2)}$. If a fraction $f_{AGN}$ of the observed rate of BH-BH mergers (${\cal}{R}_{BH-BH}$) come from AGN, we expect a rate of NS-BH (NS-NS) mergers from the AGN channel of ${\cal}{R}_{BH-NS} \sim f_{AGN}[10,300]\rm{Gpc}^{-3} \rm{yr}^{-1}$,(${\cal}{R}_{NS-NS} \leq f_{AGN}400\rm{Gpc}^{-3} \rm{yr}^{-1}$). Allowing for the ratio of NS-NS/BH-BH LIGO search volumes, from preliminary O3 results we can rule out the AGN channel as a dominant contribution to observed NS-NS mergers. The number of lower mass gap events in this channel is a strong function of the nuclear MF and mass segregation efficiency. Compact object merger ratios derived from LIGO can restrict models of MF, mass segregation and populations embedded in AGN disks. The expected number of EM counterparts to NS-BH mergers in AGN disks at $z<1$ is $\sim [30,900]{\rm{yr}}^{-1}(f_{AGN}/0.1)$. EM searches for flaring due to embedded events in large AGN surveys will complement LIGO constraints on AGN models and the embedded populations that must live in them.
