论文标题
AGN吸积盘中二元黑洞的演变：盘二进制相互作用和重力波发射
Evolution of binary black holes in AGN accretion discs: Disc-binary interaction and gravitational wave emission
论文作者
论文摘要
二进制黑洞（BBH）合并是Ligo/处女座检测到的重力波（GW）事件的主要来源。嵌入活性银河核（AGN）积聚盘中的二元黑洞是此类GW事件的候选者。我们通过结合二元相互作用和GW Inspiral的进化方程来开发一个理想化的分析模型，以用于AGN积聚盘中BBH的轨道演变。我们研究了从大轨道分离的圆盘驱动状态转变为小分离的GW驱动方案的耦合的“圆盘+GW”驱动的演变。在这个进化渠道中，BBH合并通过圆盘主导的轨道衰变和轨道偏心率的结合加速。我们提供了由此产生的合并时间表$τ_\ text {合并} $的量化，并分析其对积聚盘和二进制轨道参数的依赖性。通过计算轨道偏心率与GW频率的函数的演变，我们预测AGN光盘中的大多数二进制文件应具有明显的残留偏心率（$ e \ sim 0.01-0.1 $），可能会被LISA检测到。我们进一步讨论了在二元进化路径框架中这种特定BBH-IN-IN-IN-IN-IN-IN-IN-IN-IN-AGN通道的潜力和警告。
Binary black hole (BBH) mergers are the primary sources of gravitational wave (GW) events detected by LIGO/Virgo. Binary black holes embedded in the accretion discs of active galactic nuclei (AGN) are possible candidates for such GW events. We develop an idealised analytic model for the orbital evolution of BBHs in AGN accretion discs by combining the evolution equations of disc-binary interaction and GW inspiral. We investigate the coupled `disc+GW'-driven evolution of BBHs transitioning from the disc-driven regime at large orbital separations into the GW-driven regime at small separations. In this evolution channel, BBH mergers are accelerated by a combination of orbital decay and orbital eccentricity growth in the disc-dominated regime. We provide a quantification of the resulting merger timescale $τ_\text{merger}$, and analyse its dependence on both the accretion disc and binary orbital parameters. By computing the evolution of the orbital eccentricity as a function of the GW frequency, we predict that most binaries in AGN discs should have significant residual eccentricities ($e \sim 0.01-0.1$), potentially detectable by LISA. We further discuss the potentials and caveats of this particular BBH-in-AGN channel in the framework of binary evolutionary paths.
