论文标题
来自银河系中心的增生改性的恒星质量黑洞分布和毫米Hz引力波背景
Accretion-modified stellar-mass black hole distribution and milli-Hz gravitational wave backgrounds from galaxy centre
论文作者
论文摘要
活跃银河核的积聚盘中嵌入的恒星质量黑洞\，（SBHS）或星星的气体积聚将改变这些SBH和星星的质量分布，这也会影响SBHS/星的迁移。随着质量积聚效应的引入，我们通过将SBH/Star分布的Fokker-Planck方程扩展到质量变化的情况，以一致的方式模拟SBH/Star分布函数的演变，并探索Galaxy Center核区域中SBH的质量分布。我们发现SBHS可以长到几个太阳质量并形成较重的SBH二进制物，这将有助于我们理解当前和未来的基于地面的强力波探测器\，例如Ligo/Virgo，Et和Cosmic Explorer的黑洞质量分布）。我们进一步估计了围绕大型黑洞的SBH的极端质量比率灵感\（EMRI）的事件率，并计算Emris的随机引力波\（GW）背景。我们发现，在考虑了嵌入AGN磁盘中的SBH之后，可以在未来的太空传播GW探测器中检测到背景，而质量积聚对GW背景的影响略有影响。
Gas accretion of embedded stellar-mass black holes\,(sBHs) or stars in the accretion disk of active galactic nuclei\,(AGNs) will modify the mass distribution of these sBHs and stars, which will also affect the migration of the sBHs/stars. With the introduction of the mass accretion effect, we simulate the evolution of the sBH/star distribution function in a consistent way by extending the Fokker-Planck equation of sBH/star distributions to the mass-varying scenario, and explore the mass distribution of sBHs in the nuclear region of the galaxy centre. We find that the sBHs can grow up to several tens solar mass and form heavier sBH binaries, which will be helpful for us to understand the black-hole mass distribution as observed by the current and future ground-based gravitational wave detectors\,(e.g., LIGO/VIRGO, ET and Cosmic Explorer). We further estimate the event rate of extreme mass-ratio inspirals\,(EMRI) for sBH surrounding the massive black hole and calculate the stochastic gravitational wave\,(GW) background of the EMRIs. We find that the background can be detected in future space-borne GW detectors after considering the sBHs embedded in the AGN disk, while the mass accretion has a slight effect on the GW background.
