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arXiv 1902.01419astro-ph.HEastro-ph.COastro-ph.SR
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跨越宇宙时间的黑洞与中子星合并的性质

The properties of merging black holes and neutron stars across cosmic time

Michela Mapelli, Nicola Giacobbo, Filippo Santoliquido, M. Celeste Artale

摘要:

下一代地基引力波干涉仪将可能观测到双星黑洞(BBH)和双星中子星(BNS)的合并,分别使$z\gtrsim{}10$和$z\gtrsim{}2$红移。在这里,我们的性质合并BBH,BNS和中子星黑洞双星跨越宇宙时间的特点,人口合成模拟结合的Illustris宇宙学模拟。我们发现,合并紧凑的对象的质量不依赖于(或依赖于非常温和)的合并红移。即使是黑洞的质量分布也只是轻微地依赖于红移,因为起源于贫金属祖先($Z\leq{}4\times{}10^{-3}$)的黑洞在整个宇宙时间内占了合并黑洞的全部数量。对于一个共包线效率的$α\ge{}3$,在最后一个Gyr中合并的黑洞质量分布与超过11 Gyr前合并的黑洞质量分布之间的主要区别是,在最后一个Gyr中有过量的重合并黑洞($20-35$ M $_\odot$)。这种过量是由大规模BBH的较长延迟时间解释的。

英文摘要:

The next generation ground-based gravitational wave interferometers will possibly observe mergers of binary black holes (BBHs) and binary neutron stars (BNSs) to redshift $z\gtrsim{}10$ and $z\gtrsim{}2$, respectively. Here, we characterize the properties of merging BBHs, BNSs and neutron star-black hole binaries across cosmic time, by means of population-synthesis simulations combined with the Illustris cosmological simulation. We find that the mass of merging compact objects does not depend (or depends very mildly) on the merger redshift. Even the mass distribution of black holes depends only mildly on redshift, because BBHs originating from metal-poor progenitors ($Z\leq{}4\times{}10^{-3}$) dominate the entire population of merging BBHs across cosmic time. For a common-envelope efficiency $α\ge{}3$, the main difference between the mass distribution of BBHs merging in the last Gyr and that of BBHs merging more than 11 Gyr ago is that there is an excess of heavy merging black holes ($20-35$ M$_\odot$) in the last Gyr. This excess is explained by the longer delay time of massive BBHs.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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