论文标题
核星簇中的大型黑洞组件
Massive black hole assembly in nuclear star clusters
论文作者
论文摘要
核星簇将碎片片段碎裂成原位的原位，在原始的中心，为形成质量$ 10^3-10^6m_ \ odot $的中间质量黑洞的形成提供了理想的环境。我们利用Rapster（公共快速群集演化代码）中实现的半分析模型。我们将简单的食谱实施，以通过恒星黑洞种子的重复合并来实现代码中的恒星碰撞和气体积聚/驱动器，并确定每个通道有助于中间质量黑洞的动态形成。我们发现，如果核簇的初始平均密度为$> 10^8m_ \ odot \，{\ rm pc}^{ - 3} $，则在富含气体环境中的中间质量黑洞形成几乎是不可避免的。在最重的（$> 10^7m_ \ odot $）和最紧凑的（$ <0.5〜 {\ rm pc} $）核簇中，一个百万太阳能黑洞可以在100〜MYR内形成100〜MYR。我们证明，到目前为止，这些类似于矮星系中观察到的核簇范围，并且大规模黑洞形成过程中存在潜在的重力波特征。
Nuclear star clusters, which fragment into metal-poor stars in situ at the centers of protogalaxies, provide ideal environments for the formation of intermediate-mass black holes with masses $10^3-10^6M_\odot$. We utilize the semianalytic model implemented in Rapster, a public rapid cluster evolution code. We implement simple recipes for stellar collisions and gas accretion/expulsion into the code and identify the regimes where each channel contributes to the dynamical formation of intermediate-mass black holes via repeated mergers of stellar black hole seeds. We find that intermediate-mass black hole formation in gas-rich environments is almost inevitable if the initial mean density of the nuclear cluster is $>10^8M_\odot\,{\rm pc}^{-3}$. A million solar mass black hole can form within 100~Myr in the heaviest ($>10^7M_\odot$) and most compact ($<0.5~{\rm pc}$) nuclear clusters. We demonstrate that by today these resemble the observed range of nuclear clusters in dwarf galaxies and that there are potential gravitational-wave signatures of the massive black hole formation process.
