Einstein@Home all-sky search for periodic gravitational waves in LIGO S5 data
Einstein@Home all-sky search for periodic gravitational waves in LIGO S5 data
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DOI：
10.1103/physrevd.87.042001
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发表时间：
2013-02-13
影响因子：
5
通讯作者：
Anderson, D. P.
中科院分区：
文献类型：
--
作者：
Aasi, J.;Abadie, J.;Anderson, D. P.
本文介绍了第五次 LIGO 科学运行 (S5) 频率范围 [50, 1190] Hz 且频率导数范围类似于 [-20, 1.1] x 10(-10) Hz s(-1) 的全天搜索周期引力波的结果。该搜索使用非相干霍夫变换方法来组合来自约一天时间尺度的相干搜索的信息。由于这些搜索的计算量非常大，因此它们是通过 Einstein@Home 志愿者分布式计算项目进行的。后处理识别八个候选信号；更深入的后续研究排除了它们。因此，由于没有发现引力波信号，我们报告了固有引力波应变幅度 h(0) 的上限。例如，在 152.5 Hz 的 0.5 Hz 宽频带中，我们可以在 90% 的置信水平下排除 h(0) 大于 7.6 x 10(-25) 的信号的存在。此次搜索的灵敏度比之前 Einstein@Home 对早期 S5 LIGO 数据的搜索敏感度高出 3 倍。
This paper presents results of an all-sky search for periodic gravitational waves in the frequency range [50, 1190] Hz and with frequency derivative range of similar to[-20, 1.1] x 10(-10) Hz s(-1) for the fifth LIGO science run (S5). The search uses a noncoherent Hough-transform method to combine the information from coherent searches on time scales of about one day. Because these searches are very computationally intensive, they have been carried out with the Einstein@Home volunteer distributed computing project. Postprocessing identifies eight candidate signals; deeper follow-up studies rule them out. Hence, since no gravitational wave signals have been found, we report upper limits on the intrinsic gravitational wave strain amplitude h(0). For example, in the 0.5 Hz-wide band at 152.5 Hz, we can exclude the presence of signals with h(0) greater than 7.6 x 10(-25) at a 90% confidence level. This search is about a factor 3 more sensitive than the previous Einstein@Home search of early S5 LIGO data.