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arXiv 2105.06360gr-qcastro-ph.HE
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用唯象波形模型详细分析GW190521

A detailed analysis of GW190521 with phenomenological waveform models

Héctor Estellés, Sascha Husa, Marta Colleoni, Maite Mateu-Lucena, Maria de Lluc Planas, Cecilio García-Quirós, David Keitel, Antoni Ramos-Buades, Ajit Kumar Meh… 展开作者

Héctor Estellés, Sascha Husa, Marta Colleoni, Maite Mateu-Lucena, Maria de Lluc Planas, Cecilio García-Quirós, David Keitel, Antoni Ramos-Buades, Ajit Kumar Mehta, Alessandra Buonanno, Serguei Ossokine

摘要:

在本文中,我们提出了一个广泛的分析GW 190521引力波事件与当前(第四)代的唯象波形模型的二元黑洞合并。GW190521从其他事件中脱颖而出,因为只有几个波周期可观察到。这导致了许多挑战,其中之一是这种短信号倾向于不解决近似波形退化,这可能导致多模态后验分布。我们使用的波形模型的家庭包括一个新的快速时域模型IMRPhenomTPHM,它允许我们广泛的测试不同的先验和鲁棒性相对于波形模型的变化,包括球谐模式的内容。我们澄清了最近的一篇论文[Nitz&Capano]中提出的一些问题,这些问题与高质量比源的可能支持有关,但证实了他们对多模态后验分布的发现,尽管峰值的统计显著性存在重要差异。特别是,我们发现,支持两个质量外的PISN质量间隙,并支持一个中间质量比的二进制显着减少相对于什么Nitz和Capano发现。我们还提供了更新的概率关联GW 190521从ZTF潜在的电磁对应物。

英文摘要:

In this paper we present an extensive analysis of the GW190521 gravitational wave event with the current (fourth) generation of phenomenological waveform models for binary black hole coalescences. GW190521 stands out from other events since only a few wave cycles are observable. This leads to a number of challenges, one being that such short signals are prone to not resolve approximate waveform degeneracies, which may result in multi-modal posterior distributions. The family of waveform models we use includes a new fast time-domain model IMRPhenomTPHM, which allows us extensive tests of different priors and robustness with respect to variations in the waveform model, including the content of spherical harmonic modes. We clarify some issues raised in a recent paper [Nitz&Capano], associated with possible support for a high-mass ratio source, but confirm their finding of a multi-modal posterior distribution, albeit with important differences in the statistical significance of the peaks. In particular, we find that the support for both masses being outside the PISN mass-gap, and the support for an intermediate mass ratio binary are drastically reduced with respect to what Nitz&Capano found. We also provide updated probabilities for associating GW190521 to the potential electromagnetic counterpart from ZTF.

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