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arXiv 1609.05916astro-ph.HE
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在先进的LIGO中用自旋照亮黑洞双星形成通道

Illuminating Black Hole Binary Formation Channels with Spins in Advanced LIGO

Carl L. Rodriguez, Michael Zevin, Chris Pankow, Vicky Kalogera, Frederic A. Rasio

摘要:

最近发现的双星黑洞合并GW 150914和GW 151226开创了引力波天文学领域。对于这些来源提出的两个主要形成通道,即银河场中的孤立双星演化和致密星团中的动力学形成,预测的质量和合并率显着重叠,使任何仅依赖测量质量的天体物理学主张变得复杂。在这里,我们研究的分布自旋轨道失调预计从外地和密集的星团的双星。在黑洞出生踢的标准假设下,我们发现,类似于GW150914的黑洞双星可以形成显着的自旋轨道错位,只有通过动力学过程。特别是,这些重黑洞双星只能形成一个显着的自旋轨道反对齐的动力学通道。我们的研究结果表明,未来的检测合并黑洞二进制可测量的自旋将使我们能够确定这些系统的主要形成渠道。

英文摘要:

The recent detections of the binary black hole mergers GW150914 and GW151226 have inaugurated the field of gravitational-wave astronomy. For the two main formation channels that have been proposed for these sources, isolated binary evolution in galactic fields and dynamical formation in dense star clusters, the predicted masses and merger rates overlap significantly, complicating any astrophysical claims that rely on measured masses alone. Here, we examine the distribution of spin- orbit misalignments expected for binaries from the field and from dense star clusters. Under standard assumptions for black-hole natal kicks, we find that black-hole binaries similar to GW150914 could be formed with significant spin-orbit misalignment only through dynamical processes. In particular, these heavy-black-hole binaries can only form with a significant spin-orbit anti-alignment in the dynamical channel. Our results suggest that future detections of merging black hole binaries with measurable spins will allow us to identify the main formation channel for these systems.

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