All-sky search for periodic gravitational waves in the full S5 LIGO data
All-sky search for periodic gravitational waves in the full S5 LIGO data
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在完整的 S5 LIGO 数据中全天搜索周期性引力波
DOI：
10.1103/physrevd.85.022001
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发表时间：
2012
影响因子：
5
通讯作者：
Abadie J
中科院分区：
文献类型：
--
作者：
Abadie J
我们报告了一个全天搜索周期引力波的频率在50-800赫兹和频率的时间导数在0到。这样的信号可能是由我们银河系附近的一颗旋转的、略微非轴对称的孤立中子星星产生的。在最近改进了搜索程序，提高了计算效率之后，我们搜索了LIGO第五次科学运行期间收集的两年数据，并获得了迄今为止最敏感的引力波应变的全天上限。在150 Hz附近，我们对最坏情况下的线偏振应变振幅的上限是，而在我们的频率范围的高端，我们对所有偏振和天空位置实现了最坏情况下的上限。这些结果比先前公布的数据提高了2倍。利用松散相干算法的新检测管道能够跟踪较弱的异常值，将可以检测到信号的空间体积增加了10倍，但没有发现任何引力波信号。管道已经测试了鲁棒性方面的偏差从一个孤立的中子星星的模型，如由一个低质量或长周期的二进制同伴。
We report on an all-sky search for periodic gravitational waves in the frequency band 50–800 Hz and with the frequency time derivative in the range of 0 through. Such a signal could be produced by a nearby spinning and slightly nonaxisymmetric isolated neutron star in our Galaxy. After recent improvements in the search program that yielded aincrease in computational efficiency, we have searched in two years of data collected during LIGO’s fifth science run and have obtained the most sensitive all-sky upper limits on gravitational-wave strain to date. Near 150 Hz our upper limit on worst-case linearly polarized strain amplitudeis, while at the high end of our frequency range we achieve a worst-case upper limit offor all polarizations and sky locations. These results constitute a factor of 2 improvement upon previously published data. A new detection pipeline utilizing a loosely coherent algorithm was able to follow up weaker outliers, increasing the volume of space where signals can be detected by a factor of 10, but has not revealed any gravitational-wave signals. The pipeline has been tested for robustness with respect to deviations from the model of an isolated neutron star, such as caused by a low-mass or long-period binary companion.