混淆Head-On Collisions与旋进中等质量双星黑洞并合
Confusing Head-On Collisions with Precessing Intermediate-Mass Binary Black Hole Mergers
摘要：
我们报告的引力波信号之间的简并从准圆进动黑洞合并和那些极端偏心合并，即迎面碰撞。使用准圆形双星模型对迎面碰撞的数值模拟信号进行模型选择，我们发现，对于15和25的信噪比，典型的高级LIGO观测，与$M\in (125,300)M_\odot$和$M\in (200,440)M_\odot$各自总质量的迎面合并将被识别为旋进准圆形中等质量黑洞双星，位于更大的距离。排除正面碰撞的情况需要使用目前不存在的正面碰撞波形模型进行模型选择，同时将天体物理学驱动的先验应用于这些事件的（罕见）发生。我们表明，在紧凑的二进制文件的标准参数推断的情况下，可能会报告组件质量内（外）对不稳定超新星间隙，真正的对象可能是一个迎面合并质量外（内）这个差距。我们简要讨论了这些发现对最近引力波探测GW 190521的潜在影响，我们在[Phys. Rev. Lett. 126，081101]。
英文摘要：
We report a degeneracy between the gravitational-wave signals from quasi-circular precessing black-hole mergers and those from extremely eccentric mergers, namely head-on collisions. Performing model selection on numerically simulated signals of head-on collisions using models for quasi-circular binaries we find that, for signal-to-noise ratios of 15 and 25, typical of Advanced LIGO observations, head-on mergers with respective total masses of $M\in (125,300)M_\odot$ and $M\in (200,440)M_\odot$ would be identified as precessing quasi-circular intermediate-mass black hole binaries, located at a much larger distance. Ruling out the head-on scenario would require to perform model selection using currently nonexistent waveform models for head-on collisions, together with the application of astrophysically motivated priors on the (rare) occurrence of those events. We show that in situations where standard parameter inference of compact binaries may report component masses inside (outside) the pair-instability supernova gap, the true object may be a head-on merger with masses outside (inside) this gap. We briefly discuss the potential implications of these findings for the recent gravitational-wave detection GW190521, which we analyse in detail in [Phys. Rev. Lett. 126, 081101].
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