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All-sky Ligo Search For Periodic Gravitational Waves In The Early Fifth-science-run Data

机译:全天空Ligo在第五次科学运行的早期数据中寻找周期性引力波

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We report on an all-sky search with the LIGO detectors for periodic gravitational waves in the frequency range 50-1100 Hz and with the frequency's time derivative in the range -5 × 10~(-9)-0 Hz s~(-1). Data from the first eight months of the fifth LIGO science run (S5) have been used in this search, which is based on a sernicoherent method (PowerFlux) of summing strain power. Observing no evidence of periodic gravitational radiation, we report 95% confidence-level upper limits on radiation emitted by any unknown isolated rotating neutron stars within the search range. Strain limits below 10~(-24) are obtained over a 200-Hz band, and the sensitivity improvement over previous searches increases the spatial volume sampled by an average factor of about 100 over the entire search band. For a neutron star with nominal equatorial ellipticity of 10~(-6). the search is sensitive to distances as great as 500 pc.
机译:我们报告了使用LIGO探测器对50-1100 Hz频率范围内的周期性引力波以及-5×10〜(-9)-0 Hz s〜(-1)范围内的频率的时间导数进行的全天搜索)。该搜索使用了第五次LIGO科学运行(S5)的前八个月的数据,该数据基于对应变功率求和的现代方法(PowerFlux)。没有观察到周期性引力辐射的证据,我们报告了在搜索范围内任何未知的孤立旋转中子星发出的辐射的置信度上限为95%。在200Hz频段上获得低于10〜(-24)的应变极限,并且与之前的搜索相比,灵敏度的提高使整个搜索频段上采样的空间体积平均增加了约100倍。对于名义赤道椭圆度为10〜(-6)的中子星。搜索对最大500 pc的距离敏感。

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