Erratum: All-sky search for periodic gravitational waves in LIGO S4 data [Phys. Rev. D 77 , 022001 (2008)]
Erratum: All-sky search for periodic gravitational waves in LIGO S4 data [Phys. Rev. D 77 , 022001 (2008)]
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勘误表：LIGO S4 数据中周期性引力波的全天空搜索 [Phys.
DOI：
10.1103/physrevd.80.129904
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发表时间：
2009
影响因子：
5
通讯作者：
Abbott B
中科院分区：
文献类型：
--
作者：
Abbott B
我们报告了用LIGO探测器全天搜索频率在50 - 1000hz范围内的周期性引力波，频率的时间导数在零范围内。LIGO第四次科学运行（S4）的数据被用于这次搜索。用三种不同的半相干方法对校准数据的短傅立叶变换（SFTs）进行应变功率的变换和求和。第一种方法是StackSlide，取每个SFT的标准化功率的平均值。一种“加权霍夫”方案也被开发和使用，它也允许多干涉仪搜索。第三种方法是PowerFlux，它是StackSlide方法的变体，在求和之前对功率进行加权。加权Hough法和PowerFlux法都是根据噪声和探测器天线方向图来选择权重，以最大限度地提高信噪比。讨论了这些方法各自的优缺点。没有观测到周期性引力辐射的证据，我们报告了上限；我们把这些解释为孤立旋转中子星辐射的极限。对于全天空各向同性分布、自转轴各向同性分布的模拟震源，基于种群的引力波应变幅值的95%置信度的最佳上限为（140 Hz附近）。对于天空上的小块，对于自转轴的最佳情况和最坏情况的倾斜度，也获得了严格的上限。
We report on an all-sky search with the LIGO detectors for periodic gravitational waves in the frequency range 50–1000 Hz and with the frequency’s time derivative in the rangeto zero. Data from the fourth LIGO science run (S4) have been used in this search. Three different semicoherent methods of transforming and summing strain power from short Fourier transforms (SFTs) of the calibrated data have been used. The first, known as StackSlide, averages normalized power from each SFT. A “weighted Hough” scheme is also developed and used, which also allows for a multi-interferometer search. The third method, known as PowerFlux, is a variant of the StackSlide method in which the power is weighted before summing. In both the weighted Hough and PowerFlux methods, the weights are chosen according to the noise and detector antenna-pattern to maximize the signal-to-noise ratio. The respective advantages and disadvantages of these methods are discussed. Observing no evidence of periodic gravitational radiation, we report upper limits; we interpret these as limits on this radiation from isolated rotating neutron stars. The best population-based upper limit with 95% confidence on the gravitational-wave strain amplitude, found for simulated sources distributed isotropically across the sky and with isotropically distributed spin axes, is(near 140 Hz). Strict upper limits are also obtained for small patches on the sky for best-case and worst-case inclinations of the spin axes.