Frequency-domain analysis of black-hole ringdowns
Frequency-domain analysis of black-hole ringdowns
复制标题
黑洞振铃的频域分析
作者：
E. Finch;C. Moore
我们提出了一种新的，频域的方法来分析的引力波衰荡信号的二元黑洞和准正规模式的频率的残留物的识别。我们的方法避免了通常预期的频谱泄漏的问题（与突然开始的振铃），通过建模的inspiral和合并部分的信号使用灵活的总和的正弦高斯小波截断在发病的振铃。在频域中进行分析，使我们能够使用标准的（现在已经很好地建立）贝叶斯推理管道的引力波数据，以及给我们的能力，很容易搜索天空的位置和振铃开始时间，虽然我们发现，有必要使用一个信息先验的后者。我们测试我们的方法，用它来分析几个模拟信号与不同的信噪比注入到两个和三个检测器网络。我们发现，我们的频域方法通常能够放置更严格的限制比标准的时域分析的剩余黑洞的质量和自旋。
We propose a novel, frequency-domain approach to the analysis of the gravitational-wave ringdown signal of binary black holes and the identification of quasinormal mode frequencies of the remnant. Our approach avoids the issues of spectral leakage that would normally be expected (associated with the abrupt start of the ringdown) by modeling the inspiral and merger parts of the signal using a flexible sum of sine-Gaussian wavelets truncated at the onset of the ringdown. Performing the analysis in the frequency domain allows us to use standard (and by now well-established) Bayesian inference pipelines for gravitational-wave data as well as giving us the ability to readily search over the sky position and the ringdown start time, although we find that it is necessary to use an informative prior for the latter. We test our method by using it to analyze several simulated signals with varying signal-to-noise ratios injected into twoand three-detector networks. We find that our frequency-domain approach is generally able to place tighter constraints on the remnant black-hole mass and spin than a standard time-domain analysis.