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arXiv 0907.1949astro-ph.CO
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CMB各向异性的大尺度线形异常:应用于WMAP 5年图的残差新检验

Large scale alignment anomalies of CMB anisotropies: a new test for residuals applied to WMAP 5yr maps

Alessandro Gruppuso, Carlo Burigana

摘要:

我们分析了WMAP 5 yr版本的各种地图的低多极子(四极和八极)的对齐:用ILC和MCMC方法获得的CMB地图,前景减少后的V波段的CMB地图,以及用于比较的(未清理的)V波段地图。我们研究有多少这种对齐是污染的银河系地区的残差。在所考虑的地图,WMAP-ILC原来是最干净的地图,从所提出的测试的角度来看。研究对准估计器的概率分布函数的每个箱的再分布(由于掩蔽过程)已经发现了该结果。通过构造,我们的方法通过蒙特卡罗模拟是可行的,适用于在分析来自当前和即将到来的CMB各向异性实验的数据中采用的任何可能的掩模,并且它只能排除所考虑的映射是干净的。

英文摘要:

We analyze the alignment of the low multipoles (quadrupole and octupole) of various maps of the WMAP 5yr release: the CMB maps obtained with ILC and MCMC methods, the CMB map in the V band after foreground reduction, and, for comparison, the (not cleaned) V band map. We study how much this alignment is polluted by residuals on the Galactic region. Among the considered maps, the WMAP-ILC turns out to be the most clean map from the point of view of the proposed test. This result has been found studying the redistribution (due to the masking process) of each bin of the probability distribution functions of the alignment estimators. By construction, our method, feasible through Monte Carlo simulations, works for any possible mask adopted in the analysis of data from current and forthcoming CMB anisotropy experiments and it can only exclude that the considered map is clean.

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