论文标题
高级重力波探测器可以看到的超级质量黑洞附近的二进制黑洞合并的参数分布
Parameter Distributions of Binary Black Hole Mergers Near Supermassive Black Holes as Seen by Advanced Gravitational Wave Detectors
论文作者
论文摘要
银河核（GNS）中超级质量黑洞（SMBH）周围的环境有望携带恒星质量二进制黑洞（BBH）种群。建议这些二进制文件与SMBH形成分层三重系统，而来自SMBH的引力扰动可以通过Lidov-Kozai（LK）振荡来增强BBH的合并。先前的研究确定了单个GN中此合并通道的预期二进制参数分布。在这里，我们说明了SMBH周围BBH的不同空间分布和质量分布模型，并执行直接的高精度正规化N体型模拟，包括纽顿后（PN）术语为PN2.5订单，以模拟单个GNS中的BBH群体。我们使用具有非零偏心率的BBHS的完整Inspiral-Merger-Ringdown波形模型，并考虑了观察性选择效果，以确定LK诱导的BBH的参数分布，该分布来自宇宙中所有GNS的单个高级重力波（GW）检测器检测到的LK诱导的BBH。我们发现，检测到的合并总二元质量分布向较低的质量倾斜，质量比分布大致均匀。红移分布在〜0.15-0.55之间的峰值，并且绝大多数二进制组合在红移〜1.1中。进入Ligo/处女座/Kagra带的二进制组的比例> 0.1低于10％。我们确定了残余偏心率和质量参数之间的负相关，以及残余偏心率和源距离之间的负相关性。我们对二进制参数之间的参数分布和相关性的结果可能使该合并通道从其他BBH合并通道统计学上解散。
The environment surrounding supermassive black holes (SMBHs) in galactic nuclei (GNs) is expected to harbour stellar-mass binary black hole (BBH) populations. These binaries were suggested to form a hierarchical triple system with the SMBH, and gravitational perturbations from the SMBH can enhance the mergers of BBHs through Lidov-Kozai (LK) oscillations. Previous studies determined the expected binary parameter distribution for this merger channel in single GNs. Here we account for the different spatial distribution and mass distribution models of BBHs around SMBHs and perform direct high-precision regularized N-body simulations, including Post-Newtonian (PN) terms up to order PN2.5, to model merging BBH populations in single GNs. We use a full inspiral-merger-ringdown waveform model of BBHs with nonzero eccentricities and take into account the observational selection effect to determine the parameter distributions of LK-induced BBHs detected with a single advanced gravitational-wave (GW) detector from all GNs in the Universe. We find that the detected mergers' total binary mass distribution is tilted towards lower masses, and the mass ratio distribution is roughly uniform. The redshift distribution peaks between ~0.15-0.55, and the vast majority of binaries merge within redshift ~1.1. The fraction of binaries entering the LIGO/Virgo/KAGRA band with residual eccentricities >0.1 is below ~10%. We identify a negative correlation between residual eccentricity and mass parameters and a negative correlation between residual eccentricity and source distance. Our results for the parameter distributions and correlations among binary parameters may make it possible to disentangle this merger channel from other BBH merger channels statistically.
