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arXiv 2203.14529astro-ph.HEastro-ph.SRgr-qc
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稳定的质量转移可以解释具有高自旋分量的大质量双黑洞合并

Stable mass transfer can explain massive binary black hole mergers with a high spin component

Yong Shao, Xiang-Dong Li

摘要:

最近的引力波观测表明,具有大质量组分的双黑洞(BBH)合并更可能具有高有效自旋。在孤立双星演化模型中,BH自旋主要来源于BH形成前坍缩核的角动量。观测和理论都表明黑洞倾向于具有相对较低的自旋,快速自旋黑洞的起源仍然是一个谜。我们研究了一个替代的过程,稳定的情况下A的质量转移可能会显着增加BH自旋在大规模BH双星的演变。我们提出了详细的二元演化计算,发现这一过程可以解释观察到的高自旋的一些大规模的BBH合并的假设下,温和的超爱丁顿吸积。

英文摘要:

Recent gravitational wave observations showed that binary black hole (BBH) mergers with massive components are more likely to have high effective spins. In the model of isolated binary evolution, BH spins mainly originate from the angular momenta of the collapsing cores before BH formation. Both observations and theories indicate that BHs tend to possess relatively low spins, the origin of fast-spinning BHs remains a puzzle. We investigate an alternative process that stable Case A mass transfer may significantly increase BH spins during the evolution of massive BH binaries. We present detailed binary evolution calculations and find that this process can explain observed high spins of some massive BBH mergers under the assumption of mildly super-Eddington accretion.

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