Inferences about Supernova Physics from Gravitational-Wave Measurements: GW151226 Spin Misalignment as an Indicator of Strong Black-Hole Natal Kicks.
Inferences about Supernova Physics from Gravitational-Wave Measurements: GW151226 Spin Misalignment as an Indicator of Strong Black-Hole Natal Kicks.
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从引力波测量中得出的关于超新星物理的推论：GW151226 自旋错位作为强黑洞出生踢的指标。
DOI：
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发表时间：
2017
影响因子：
8.6
通讯作者：
D. Wysocki
中科院分区：
文献类型：
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作者：
R. O’Shaughnessy;D. Gerosa;D. Wysocki
双星黑洞GW 151226的推断参数与质量最大的黑洞的非零自旋一致，与双星的轨道角动量不一致。如果黑洞是从一颗初始排列的双星星星通过孤立的双星演化而形成的，那么这种不对准就可能是由于恒星坍缩过程中第一个诞生的黑洞在诞生时受到的纳塔尔踢。我们用简单的运动学参数来限制这个反冲的特征量，发现黑洞在出生时必须被施加一个vk <$50 km/s的纳塔尔反冲，才能产生与GW 151226一致的失调。如此大的纳塔尔反冲超过了目前大多数超新星和双星演化模型中默认采用的反冲。
The inferred parameters of the binary black hole GW151226 are consistent with nonzero spin for the most massive black hole, misaligned from the binary's orbital angular momentum. If the black holes formed through isolated binary evolution from an initially aligned binary star, this misalignment would then arise from a natal kick imparted to the first-born black hole at its birth during stellar collapse. We use simple kinematic arguments to constrain the characteristic magnitude of this kick, and find that a natal kick v_{k}≳50 km/s must be imparted to the black hole at birth to produce misalignments consistent with GW151226. Such large natal kicks exceed those adopted by default in most of the current supernova and binary evolution models.