可疑的黑洞：孤立双星演化中质量和自旋在各分量黑洞上的分布
Suspicious Siblings: The Distribution of Mass and Spin Across Component Black Holes in Isolated Binary Evolution
摘要：
LIGO和Virgo引力波探测器已经发现了具有确定非零自旋的双黑洞系统，以及存在于更大质量的黑洞中的具有显著自旋的系统。我们调查的能力，孤立的二进制演化形成这样的高度旋转，不对称的质量系统，通过吸积到第一个出生的黑洞和潮汐自旋的第二个出生的黑洞使用快速人口合成的方法，详细考虑自旋通过潮汐相互作用。即使是最乐观的假设，在吸积恒星从捐助者接收材料的效率，我们发现，这是很难形成系统的主要黑洞组件中具有显着的质量不对称性和中等或高自旋。假设大质量恒星内的有效角动量输运和黑洞上的Eddington限制吸积，我们发现，在我们最乐观的模型中，潜在的二元黑洞种群中的系统的$< 1.5\%$具有大于0.2的主黑洞自旋和大于2：1的质量不对称性，大多数模型发现，这一标准仅在系统的$\sim 0.01\%$中得到满足。因此，在主要的黑洞成分中产生具有显著质量不对称性和自旋的系统不太可能是孤立演化的副产品，除非调用高度超爱丁顿吸积或大质量恒星中的角动量传输比通常假设的效率低。
英文摘要：
The LIGO and Virgo gravitational-wave detectors have uncovered binary black hole systems with definitively nonzero spins, as well as systems with significant spin residing in the more massive black hole of the pair. We investigate the ability of isolated binary evolution in forming such highly spinning, asymmetric-mass systems through both accretion onto the first-born black hole and tidal spin-up of the second-born black hole using a rapid population synthesis approach with detailed considerations of spin-up through tidal interactions. Even with the most optimistic assumptions regarding the efficiency at which an accreting star receives material from a donor, we find that it is difficult to form systems with significant mass asymmetry and moderate or high spins in the primary black hole component. Assuming efficient angular momentum transport within massive stars and Eddington-limited accretion onto black holes, we find that $< 1.5\%$ of systems in the underlying binary black hole population have a primary black hole spin greater than 0.2 and a mass asymmetry of greater than 2:1 in our most optimistic models, with most models finding that this criteria is only met in $\sim 0.01\%$ of systems. The production of systems with significant mass asymmetries and spin in the primary black hole component is thus an unlikely byproduct of isolated evolution unless highly super-Eddington accretion is invoked or angular momentum transport in massive stars is less efficient than typically assumed.
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