论文标题
mocca-survey数据库：额外的银河球状簇。 iii。银河系的黑洞人口和类似仙女座的星系
MOCCA-Survey Database: Extra Galactic Globular Clusters. III. The population of black holes in Milky Way and Andromeda-like galaxies
论文作者
论文摘要
在这项工作中，我们像星系一样研究了银河系中的球状簇（GC）的黑洞（BH）种群。我们将种群综合代码Masinga和Mocca-Survey数据库I结合起来，以推断具有BH子系统（BHS），IMBH或两者的GC的特性。我们发现，具有BHS，IMBH的典型GC数量，或者在银河郊区中没有一个可比的GC，而内部银河系则由GCS主导，而GC则没有明显的深色组件。我们的模型表明，与总体相比，拥有BHS的GCS携带BHS略重，半质量半径较大。我们检索了二进制BHS（BBH）的性质，这些二进制BHS（BBH）要么在最后3个GYR中合并，要么在其父群集中幸存到今天。我们发现，由于动态相互作用，大约80 \％的合并BBH形成形式，而其余的源自原始二进制的演变。我们根据所采用的假设，推断本地宇宙中BBH的合并率为$ 1.0-23 \，\，\ rm {yr^{ - 1} \，gpc^{ - 3}} $，具体取决于所采用的假设。我们发现大约100-240个BBH可以生存到今天，并且主要集中在银河系的内部kpc内。我们还估计，通过插入星形簇运输到银河核的BHS数量，发现约1,000-3,000 BHS和100-200 BBHS在12 GYR的时间跨度中运输。这使我们能够限制潜伏在核星团中的BHS和BBHS二进制文件的总量，即$ n_ {bhs} =（1.4-2.2）\ times10^4 $和$ n_ {bbhs} = 700-1,100 $。
In this work, we investigate the black hole (BH) population of globular clusters (GCs) in Milky Way- (MW) and Andromeda- (M31) like galaxies. We combine the population synthesis code MASinGa and the MOCCA-Survey Database I to infer the properties of GCs harbouring a BH subsystem (BHS), an IMBH, or neither of those. We find that the typical number of GCs with a BHS, an IMBH, or none become comparable in the galactic outskirts, whilst the inner galactic regions are dominated by GCs without a significant dark component. Our models suggest that GCs harbouring a BHS are slightly heavier and with larger half-mass radii compared to the overall population. We retrieve the properties of binary BHs (BBHs) that have either merged in the last 3 Gyr or survived in their parent cluster until present-day. We find that around 80\% of the merging BBHs form due to dynamical interactions while the remaining originate from evolution of primordial binaries. We infer a merger rate for BBHs in the local Universe of $1.0-23\,\,\rm{yr^{-1}\,Gpc^{-3}}$, depending on the adopted assumptions. We find around 100-240 BBHs survive until present-day and are mostly concentrated in the inner few kpc of the galaxy. We estimate also the number of BHs transported into the galactic nucleus by infalling star clusters, finding around 1,000-3,000 BHs and 100-200 BBHs are transported over a time span of 12 Gyr. This enables us to constrains the total amount of BHs and BBHs binaries lurking in nuclear star cluster, i.e. $N_{BHs}=(1.4-2.2)\times10^4$ and $N_{BBHs}=700-1,100$.
