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arXiv 1709.09181gr-qcastro-ph.COastro-ph.HE
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寻找完整的黑洞双星合并交响乐

Searching for the full symphony of black hole binary mergers

Ian Harry, Juan Calderón Bustillo, Alex Nitz

摘要:

目前对致密双星合并引力波特征的搜索依赖于干涉观测站的匹配滤波数据,这些数据具有一组模拟引力波形。这些搜索目前使用的模型波形不包括引力波信号的高阶模式内容。高阶模对于许多紧凑的二进制合并是重要的,它们的省略降低了对这些源的敏感性。在这项工作中,我们探讨了省略高阶模式所产生的灵敏度损失。我们提出了一种新的方法,用于搜索紧凑的二进制合并使用波形,包括高阶模式的影响,并评估的灵敏度增加,使用我们的新方法将允许。我们发现,当评估灵敏度在一个恒定的假警报率,并包括信号一致性测试可以拒绝一些信号,包括高阶模式内容的事实时,我们观察到的灵敏度增加高达2倍的高质量比,高总质量系统的体积。对于具有相等质量或具有总质量$\sim 50 M_{\odot}$的系统,我们看到更适度的灵敏度增加$< 10\%$,这表明现有的搜索已经执行得很好。我们的新搜索方法也直接适用于通用紧凑二进制搜索。

英文摘要:

Current searches for the gravitational-wave signature of compact binary mergers rely on matched-filtering data from interferometric observatories with sets of modelled gravitational waveforms. These searches currently use model waveforms that do not include the higher-order mode content of the gravitational-wave signal. Higher-order modes are important for many compact binary mergers and their omission reduces the sensitivity to such sources. In this work we explore the sensitivity loss incurred from omitting higher-order modes. We present a new method for searching for compact binary mergers using waveforms that include higher-order mode effects, and evaluate the sensitivity increase that using our new method would allow. We find that, when evaluating sensitivity at a constant rate-of-false alarm, and when including the fact that signal-consistency tests can reject some signals that include higher-order mode content, we observe a sensitivity increase of up to a factor of 2 in volume for high mass ratio, high total-mass systems. For systems with equal mass, or with total mass $\sim 50 M_{\odot}$, we see more modest sensitivity increases, $< 10\%$, which indicates that the existing search is already performing well. Our new search method is also directly applicable in searches for generic compact binaries.

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