arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1209.2125astro-ph.CO
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再论综合萨克斯-沃尔夫效应的意义

The significance of the integrated Sachs-Wolfe effect revisited

Tommaso Giannantonio, Robert Crittenden, Robert Nichol, Ashley J. Ross

摘要:

我们根据新获得的数据重新审视了综合萨克斯-沃尔夫(ISW)效应测量的状态,并解决了最近提出的对测量的批评。我们更新了Giannantonio等人先前收集的数据集,以包括宇宙微波背景(CMB)和宇宙大尺度结构(LSS)的新数据。我们发现我们的更新结果与以前的测量结果一致。通过拟合单个模板幅度,我们现在获得了4.4 sigma水平的ISW检测的组合显著性,当考虑替代数据切割和分析假设时,该显著性波动0.4 sigma。我们还进行了新的测试系统污染的数据,特别是集中在Sawangwit等人提出的问题。其中,我们解决的旋转测试,其目的是检查可能的系统学相关的随机旋转的地图对。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的旋转轴上增强了相关性,因此没有任何额外的系统性污染的迹象。我们公开发布结果、协方差矩阵以及用于获得它们的天空图。

英文摘要:

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 (CMB) and the large-scale structure (LSS) 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 4.4 sigma level, which fluctuates by 0.4 sigma 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.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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