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arXiv 2202.03584astro-ph.HEgr-qc
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根据双黑洞自旋分布估计黑洞反冲的偏差

Biases in estimates of black hole kicks from the spin distribution of binary black holes

Simon Stevenson

摘要:

LIGO和Virgo引力波天文台现已观测到超过50个二元黑洞合并。虽然中子星在超新星诞生时被赋予了很大的速度,但黑洞是否会受到类似的撞击,以及多大的撞击,仍然是一个悬而未决的问题。最近,Callister等人(2021)在假设它们都是通过孤立的双星演化形成的前提下分析了双星黑洞群,并声称合并的双星黑洞的自旋分布需要大的黑洞反冲(在99%的置信度下大于260 km/s)才能与观测结果相匹配。在这里,我们强调Callister等人(2021)提出的一个关键假设-所有次级黑洞都可以潮汐旋转-并不是由物理模型驱动的,并且可能导致他们对黑洞撞击幅度的估计存在偏差。我们只对Callister et al.(2021)模型进行了微小的修改,考虑了潮汐同步无效的更广泛的合并双星。我们表明,这自然会产生一个双峰自旋分布的二级黑洞,并在二进制黑洞人口中观察到的自旋轨道错位可以解释为更典型的黑洞踢的顺序100公里/秒,踢推断银河X射线双星包含黑洞一致。我们的结论是,大多数的二进制黑洞人口是一致的形成通过孤立的二进制演化。

英文摘要:

A population of more than 50 binary black hole mergers has now been observed by the LIGO and Virgo gravitational-wave observatories. While neutron stars are known to have large velocities associated with impulsive kicks imparted to them at birth in supernovae, whether black holes receive similar kicks, and of what magnitude, remains an open question. Recently, Callister et al. (2021) analysed the binary black hole population under the hypothesis that they were all formed through isolated binary evolution and claimed that large black hole kicks (greater than 260 km/s at 99% confidence) were required for the spin distribution of merging binary black holes to match observations. Here we highlight that a key assumption made by Callister et al. (2021) -- that all secondary black holes can be tidally spun up -- is not motivated by physical models, and may lead to a bias in their estimate of the magnitudes of black hole kicks. We make only minor changes to the Callister et al. (2021) model, accounting for a population of wider merging binaries where tidal synchronisation is ineffective. We show that this naturally produces a bimodal spin distribution for secondary black holes, and that the spin-orbit misalignments observed in the binary black hole population can be explained by more typical black hole kicks of order 100 km/s, consistent with kicks inferred from Galactic X-ray binaries containing black holes. We conclude that the majority of the binary black hole population is consistent with forming through isolated binary evolution.

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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