arXivDaily arXiv每日学术速递 周一至周五更新
北美退伍军人节（Veterans Day），12 日无更新
arXiv 2003.02919astro-ph.HE
收藏

恒星质量的双黑洞合并是各向同性分布的吗？

Are stellar--mass binary black hole mergers isotropically distributed?

Richard Stiskalek, John Veitch, Chris Messenger

备注：
8 pages, 8 figures. Accepted by MNRAS
发表信息：
MNRAS 2021 501 (1): 970-977
阅读 PDF
arXiv 页面 ↗HTML 原文 ↗

摘要：

先进的LIGO和先进的处女座引力波探测器在前两次观测运行中探测到了一群双黑洞合并。对于这些事件中的每一个，我们已经能够关联一个潜在的天空位置区域，该区域被表示为天空上的概率分布。因此，在这一点上，我们可能会开始问这样一个问题：这种分布是否符合宇宙的各向同性模型，或者是否有任何各向异性的证据。我们进行贝叶斯模型之间的选择一个各向同性和一个简单的各向异性模型，考虑到各向异性选择功能所造成的基础天线图案和灵敏度的干涉仪在恒星日。我们发现了一个不确定的贝叶斯因子$1.3:1$，这表明前两次观察运行的数据不足以选择首选模型。然而，第一次探测大多是在天空中定位不良（在高级室女座加入网络之前），跨越了天空的大部分区域，阻碍了对潜在各向异性的探测。用最近第三次LIGO观测运行的事件和一个更复杂的宇宙学模型来重复这一分析是合适的。

英文摘要：

The Advanced LIGO and Advanced Virgo gravitational wave detectors have detected a population of binary black hole mergers in their first two observing runs. For each of these events we have been able to associate a potential sky location region represented as a probability distribution on the sky. Thus, at this point we may begin to ask the question of whether this distribution agrees with the isotropic model of the Universe, or if there is any evidence of anisotropy. We perform Bayesian model selection between an isotropic and a simple anisotropic model, taking into account the anisotropic selection function caused by the underlying antenna patterns and sensitivity of the interferometers over the sidereal day. We find an inconclusive Bayes factor of $1.3:1$, suggesting that the data from the first two observing runs is insufficient to pick a preferred model. However, the first detections were mostly poorly localised in the sky (before the Advanced Virgo joined the network), spanning large portions of the sky and hampering detection of potential anisotropy. It will be appropriate to repeat this analysis with events from the recent third LIGO observational run and a more sophisticated cosmological model.

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。

↑