Searching for a ringdown overtone in GW150914
Searching for a ringdown overtone in GW150914
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DOI：
10.1103/physrevd.106.043005
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发表时间：
2022-05
影响因子：
5
通讯作者：
E. Finch;C. Moore
中科院分区：
文献类型：
--
作者：
E. Finch;C. Moore
我们重新分析了GW150914合并后的数据，寻找基本模式、四极模式之外的准正态模式。目前，文献中关于数据是否以及在多大程度上包含准正态模态泛音的证据存在持续的分歧。我们使用作者最近提出的一种频域方法来进行数据分析。与主要在时域进行的其他分析相比，我们的分析具有几个优势；特别是，作为贝叶斯铃响分析的一部分，源天空位置和铃响开始时间被边缘化（而不是简单地固定）。我们在GW150914中发现了泛音的初步证据，但其显著性低于其他地方的报道。我们的首选分析，在峰值应变振幅时间的不确定性上边缘化，给出了在$\sim 1.8\sigma$处从零峰值的泛音振幅的后验。
We reanalyze the GW150914 post-merger data searching for quasinormal modes beyond the fundamental, quadrupolar mode. There is currently an ongoing disagreement in the literature about whether, and to what extent, the data contains evidence for a quasinormal mode overtone. We use a frequency-domain approach to ringdown data analysis that was recently proposed by the authors. Our analysis has several advantages compared to other analyses performed mainly in the time domain; in particular, the source sky position and the ringdown start time are marginalized over (as opposed to simply being fixed) as part of a Bayesian ringdown analysis. We find tentative evidence for an overtone in GW150914, but at a lower significance than reported elsewhere. Our preferred analysis, marginalizing over the uncertainty in the time of peak strain amplitude, gives a posterior on the overtone amplitude peaked away from zero at $\sim 1.8\sigma$.