The significance of the integrated Sachs–Wolfe effect revisited
The significance of the integrated Sachs–Wolfe effect revisited
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DOI：
10.1111/j.1365-2966.2012.21896.x
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发表时间：
2012-09
影响因子：
4.8
通讯作者：
T. Giannantonio;R. Crittenden;R. Nichol;A. Ross
中科院分区：
文献类型：
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作者：
T. Giannantonio;R. Crittenden;R. Nichol;A. Ross
我们回顾了综合萨克斯-沃尔夫(ISW)效应测量的状态，根据新获得的数据，并解决了最近提出的对测量的批评。我们更新了Giannantonio等人先前组装的数据集。包括宇宙微波背景和宇宙大尺度结构的新数据发布。我们发现我们的更新结果与以前的测量结果是一致的。通过拟合单模板幅度，我们现在获得了在4.4σ水平上的ISW检测的综合意义，当考虑到替代的数据削减和分析假设时，该水平的波动为∼0.4σ。我们还对数据的系统性污染进行了新的测试，特别关注Sawangwit等人提出的问题。其中，我们讨论了旋转测试，其目的是通过关联随机旋转的映射对来检查可能的系统学。我们发现结果与预期的数据协方差一致，没有证据表明在任何首选旋转轴上的相关性增强，因此没有迹象表明有任何额外的系统污染。我们公开发布结果、协方差矩阵和用来获得它们的天空地图。
We revisit the state of the integrated Sachs–Wolfe (ISW) effect measurements in light of newly available data and address criticisms about the measurements which have recently been raised. We update the data set previously assembled by Giannantonio et al. to include new data releases for both the cosmic microwave background and the large-scale structure of the Universe. We find that our updated results are consistent with previous measurements. By fitting a single template amplitude, we now obtain a combined significance of the ISW detection at the 4.4σ level, which fluctuates by ∼0.4σ when alternative data cuts and analysis assumptions are considered. We also make new tests for systematic contaminations of the data, focusing in particular on the issues raised by Sawangwit et al. Amongst them, we address the rotation test, which aims at checking for possible systematics by correlating pairs of randomly rotated maps. We find results consistent with the expected data covariance, no evidence for enhanced correlation on any preferred axis of rotation, and therefore no indication of any additional systematic contamination. We publicly release the results, the covariance matrix and the sky maps used to obtain them.