论文标题
在GW150914中搜索一个响声泛音
Searching for a Ringdown Overtone in GW150914
论文作者
论文摘要
我们重新分析了GW150914合并后数据，以搜索超出基本四倍体模式之外的准模式。目前，文献上存在关于数据是否包含准模式的证据的文献存在持续的分歧。我们使用频域方法来进行回合数据分析，该数据分析最近提出了作者。与主要在时域进行的其他分析相比，我们的分析具有多个优势。特别是，作为贝叶斯响声分析的一部分，源天空位置和响声开始时间被边缘化（而不是简单地被固定）。我们发现在GW150914中有泛音的暂定证据，但其意义低于其他地方。我们的首选分析，在峰值应变振幅期间的不确定性上边缘化，使载体振幅的后部从$ \ sim1.8σ$处脱离零峰值。
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 $\sim 1.8σ$.
