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arXiv 2108.10033gr-qc
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在LIGO和Virgo数据中长持续时间引力波瞬变的观测

Searches for long-duration gravitational wave transients in LIGO and Virgo data

Adrian Macquet, Marie-Anne Bizouard, Nelson Christensen, Michael Coughlin

摘要:

随着LIGO和Virgo探测器灵敏度的提高,长寿命的引力波(GW)瞬变现象在过去十年中引起了人们的兴趣。这种信号持续10到1000秒,可能来自各种各样的来源,包括黑洞周围的吸积盘不稳定性、合并后的双星中子星、核心坍缩超新星、孤立中子星的非轴对称变形以及磁星巨星耀斑。由于参数空间很大,而且缺乏精确建模的波形,搜索必须依赖于鲁棒的检测算法,这些算法对信号的性质几乎没有假设。在这里,我们提出了一个新的数据分析管道,以搜索长寿命的瞬态GW信号的基础上,在一个网络的检测器计算的过剩的交叉功率统计。它使用分层策略,允许快速估计背景,并实现了几个功能,旨在将检测灵敏度提高30%,与旧的实现相比,信号形态范围广泛。我们还报告了GW能量的上限,从附近的磁星巨星耀斑样本周围的GW发射管道进行搜索,并讨论了这种源的检测潜力与第二代和第三代探测器。

英文摘要:

Long-lived gravitational wave (GW) transients have received interest in the last decade, as the sensitivity of LIGO and Virgo increases. Such signals, lasting between 10 and 1000s, can come from a variety of sources, including accretion disk instabilities around black holes, binary neutron stars post-merger, core-collapse supernovae, non-axisymmetric deformations in isolated neutron stars, and magnetar giant flares. Given the large parameter space and the lack of precisely modeled waveforms, searches must rely on robust detection algorithms, which make few or no assumptions on the nature of the signal. Here we present a new data analysis pipeline to search for long-lived transient GW signals, based on an excess cross-power statistic computed over a network of detectors. It uses a hierarchical strategy that allows to estimate the background quickly and implements several features aimed to increase detection sensitivity by 30% for a wide range of signal morphology compared to an older implementation. We also report upper limits on the GW energy emitted from a search conducted with the pipeline for GW emission around a sample of nearby magnetar giant flares, and discuss detection potential of such sources with second and third-generation detectors.

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