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arXiv 1807.07568astro-ph.HEastro-ph.SR
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解开合并黑洞双星的祖先

Unravelling the progenitors of merging black hole binaries

Nicola Giacobbo, Michela Mapelli, Mario Spera

摘要:

近年来的引力波探测证实了大质量恒星黑洞双星的存在,但黑洞双星的形成通道仍是一个悬而未决的问题。在这里,我们调查的人口BBHs使用我们的新的人口合成代码MOBSE。MOBSE是广泛使用的双星总体合成代码BSE(Hurley et al. 2000,Hurley et al. 2002)的更新版本,包括确定大质量恒星命运的关键要素:最新的恒星风处方和超新星模型。使用MOBSE,我们在低金属丰度下形成总质量高达$\sim{}120$ M $_\odot$的BBH,但只有总质量高达$\sim{}80$ M $_\odot$的系统在不到一个哈勃时间内合并。我们的研究结果表明,只有大质量贫金属星($Z\lesssim 0.002$)才可能是像GW 150914这样的引力波事件的祖先。此外,我们预测,合并BBH形式更有效地从金属贫比富金属的恒星。

英文摘要:

The recent detection of gravitational waves has proven the existence of massive stellar black hole binaries (BBHs), but the formation channels of BBHs are still an open question. Here, we investigate the demography of BBHs by using our new population-synthesis code MOBSE. MOBSE is an updated version of the widely used binary population-synthesis code BSE (Hurley et al. 2000, Hurley et al. 2002) and includes the key ingredients to determine the fate of massive stars: up-to-date stellar wind prescriptions and supernova models. With MOBSE, we form BBHs with total mass up to $\sim{}120$ M$_\odot$ at low metallicity, but only systems with total mass up to $\sim{}80$ M$_\odot$ merge in less than a Hubble time. Our results show that only massive metal-poor stars ($Z\lesssim 0.002$) can be the progenitors of gravitational wave events like GW150914. Moreover, we predict that merging BBHs form much more efficiently from metal-poor than from metal-rich stars.

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