论文标题
恒星 - 质量二进制黑洞合并各向同性分布吗？
Are stellar--mass binary black hole mergers isotropically distributed?
论文作者
论文摘要
高级LIGO和先进的处女座重力波检测器在前两个观察跑中检测到了二进制黑洞合并的群体。对于这些事件，我们都能够将代表的潜在天空位置区域与天空上的概率分布相关联。因此，在这一点上，我们可能会开始询问这个分布是否与宇宙的各向同性模型相符的问题，或者是否有各向异性证据。我们在局促在局促的日子内，在各向同性和简单各向异性模型之间执行贝叶斯模型选择，并在干涉仪的基础天线模式和敏感性中引起的各向异性选择函数。我们发现一个不确定的贝叶斯因子为$ 1.3：1 $，这表明前两个观察运行中的数据不足以选择首选模型。但是，最初的检测大多在天空中（先进的处女座加入网络），跨越了天空的大部分，并阻碍了潜在各向异性的检测。通过最近的第三次Ligo观察跑和更复杂的宇宙学模型重复此分析是适当的。
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.
