Upper limit map of a background of gravitational waves
Upper limit map of a background of gravitational waves
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引力波背景上限图
DOI：
10.1103/physrevd.76.082003
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发表时间：
2007
影响因子：
5
通讯作者：
Abbott B
中科院分区：
文献类型：
--
作者：
Abbott B
我们利用LIGO S4科学运行的数据和一种针对点源优化的方法来搜索引力波的各向异性背景。例如，如果引力波背景由少数不同的天体物理源主导，这是合适的。没有看到任何信号。假设源应变功率谱有两种不同的幂律，生成了上限图。对于幂律和使用50 Hz到1.8 kHz频带，源应变功率谱的上限在和之间变化，取决于在天空中的位置。同样，在恒定应变功率谱的情况下，上限在和之间变化。作为副产物，还得到了引力波各向同性背景的极限。所有的极限都在90%的置信水平。最后，作为一个应用，我们重点关注了最亮的低质量x射线双星Sco-X1的方向。比较<？格式吗?>为该方法得到的应变幅值上限与基于sco1 - x1 x射线通量的期望值的比值。
We searched for an anisotropic background of gravitational waves using data from the LIGO S4 science run and a method that is optimized for point sources. This is appropriate if, for example, the gravitational wave background is dominated by a small number of distinct astrophysical sources. No signal was seen. Upper limit maps were produced assuming two different power laws for the source strain power spectrum. For anpower law and using the 50 Hz to 1.8 kHz band the upper limits on the source strain power spectrum vary betweenand, depending on the position in the sky. Similarly, in the case of constant strain power spectrum, the upper limits vary betweenand. As a side product a limit on an isotropic background of gravitational waves was also obtained. All limits are at the 90% confidence level. Finally, as an application, we focused on the direction of Sco-X1, the brightest low-mass x-ray binary. We compare <?format ?>the upper limit on strain amplitude obtained by this method to expectations based on the x-ray flux from Sco-X1.