Search for anisotropic gravitational-wave backgrounds using data from Advanced LIGO and Advanced Virgo窶冱 first three observing runs
Search for anisotropic gravitational-wave backgrounds using data from Advanced LIGO and Advanced Virgo窶冱 first three observing runs
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使用 Advanced LIGO 和 Advanced Virgo 前三次观测运行的数据搜索各向异性引力波背景
DOI：
10.1103/physrevd.104.022005
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发表时间：
2021
影响因子：
5
通讯作者：
R. Abbott et al.
中科院分区：
文献类型：
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作者：
R. Abbott et al.
我们报告的结果从搜索各向异性随机引力波背景使用的数据从先进的LIGO和先进的处女座探测器的前三个观测运行。这是第一次，我们将处女座的数据纳入我们的分析中，并使用一种名为pystoch的新的高效管道对一个恒星日的数据进行搜索。我们使用引力波辐射测量（宽带和窄带）来产生随机引力波背景的天空图，并从点源搜索引力波。球谐分解方法被用来寻找空间扩展源的引力波辐射。两种技术都没有发现引力波信号的证据。因此，我们推导出了95%置信度上限的天空图，其范围为Fα，Θ<（0.013-7.6）×10−8 erg cm−2 s−1 Hz−1，以及来自扩展源的（归一化）引力波能量密度谱，范围为，取决于方向（）和谱指数（）。这些限值比以前的限值提高了2.9-3.5倍。我们还设置了95%的置信水平上限的准单色引力波的频率相关的应变振幅来自三个有趣的目标，天蝎座X-1，SN 1987 A和银河系中心，最好的上限范围从，一个因素的改进相比，以前的随机辐射计搜索。
We report results from searches for anisotropic stochastic gravitational-wave backgrounds using data from the first three observing runs of the Advanced LIGO and Advanced Virgo detectors. For the first time, we include Virgo data in our analysis and run our search with a new efficient pipeline calledpystoch on data folded over one sidereal day. We use gravitational-wave radiometry (broadband and narrow band) to produce sky maps of stochastic gravitational-wave backgrounds and to search for gravitational waves from point sources. A spherical harmonic decomposition method is employed to look for gravitational-wave emission from spatially-extended sources. Neither technique found evidence of gravitational-wave signals. Hence we derive 95% confidence-level upper limit sky maps on the gravitational-wave energy flux from broadband point sources, ranging from Fα,Θ<(0.013–7.6)×10−8 erg cm−2 s−1 Hz−1, and on the (normalized) gravitational-wave energy density spectrum from extended sources, ranging from, depending on direction () and spectral index (). These limits improve upon previous limits by factors of 2.9–3.5. We also set 95% confidence level upper limits on the frequency-dependent strain amplitudes of quasimonochromatic gravitational waves coming from three interesting targets, Scorpius X-1, SN 1987A and the Galactic Center, with best upper limits range from, a factor ofimprovement compared to previous stochastic radiometer searches.