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arXiv 1908.08775astro-ph.SRastro-ph.GAastro-ph.HE
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Milky Way中黑洞的综合星表

Synthetic catalog of black holes in the Milky Way

A. Olejak, K. Belczynski, T. Bulik, M. Sobolewska

摘要:

我们提出了一个开放存取的数据库,其中包括一个综合目录的黑洞在银河系。为了计算单星和双星的演化,我们使用了更新的人口合成代码StarTrack。我们应用了一个新的恒星形成历史和化学演化的银河系盘,球和晕综合观测和理论数据的模型。我们发现,在目前的时刻银河系(盘+球+晕)包含约1.2 x 10^8个平均质量约为14 Msun的单个黑洞和9.3 x 10^6个平均质量为19 Msun的双星系统黑洞。我们目前的基本统计性质的BH人口,如分布的单个和二进制BH的质量,速度,轨道参数或数量的BH二进制系统在不同的演化配置。我们发现最大质量的黑洞是在BH-MS、BH+He、BH-BH等双星系统的并合中形成的。由于恒星风的存在,恒星星族的金属丰度对最终BH质量有重要影响。因此,在我们的模拟中,最大的单BH,113 Msun,起源于合并的氦星和黑洞在低金属量恒星环境中的星系晕。双星系统中质量最大的BH为60 Msun,也是在星系晕中形成的。我们的限制,只有0.006%的总星系晕质量(包括暗物质)可以隐藏在恒星起源的BH的形式是目前的观测调查无法检测。银河系双星BH是少数(所有银河系BH的10%),其中大多数都在BH-BH系统中。目前银河系中两种常见包络模型的合并速率:BH-BH为300万~ 8100万r ^-1,BH-NS为100万~ 900万r ^-1,NS-NS为1400万~ 5900万r ^-1。数据文件可在https://bhc.syntheticuniverse.org/上查阅。

英文摘要:

We present an open-access database which includes a synthetic catalog of black holes in the Milky Way. To calculate evolution of single and binary stars we used updated population synthesis code StarTrack. We applied a new model of star formation history and chemical evolution of Galactic disk, bulge and halo synthesized from observational and theoretical data. We find that at the current moment Milky Way (disk+bulge+halo) contains about 1.2 x 10^8 single black holes with average mass of about 14 Msun and 9.3 x 10^6 BHs in binary systems with average mass of 19 Msun. We present basic statistical properties of BH populations such as distributions of single and binary BH masses, velocities, orbital parameters or numbers of BH binary systems in different evolutionary configurations. We find that the most massive BHs are formed in mergers of binary systems, such as BH-MS, BH+He, BH-BH. The metallicity of stellar population has a significant impact on the final BH mass due to the stellar winds. Therefore the most massive single BH in our simulation, 113 Msun, originates from a merger of a helium star and a black hole in a low metallicity stellar environment in Galactic halo. The most massive BH in binary system is 60 Msun and was also formed in Galactic halo. We constrain that only 0.006% of total Galactic halo mass (including dark matter) could be hidden in the form of stellar origin BHs which are not detectable by current observational surveys. Galactic binary BHs are minority (10% of all Galactic BHs) and most of them are in BH-BH systems. The current Galactic merger rates for two considered common envelope models which are: 3-81 Myr^-1 for BH-BH, 1-9 Myr^-1, for BH-NS and 14-59 Myr^-1 for NS-NS systems. Data files are available at https://bhc.syntheticuniverse.org/.

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