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By Frode K. Hansen, Paolo Cabella, Domenico Marinucci and Nicola Vittorio


We use the local curvature to investigate the possible existence of non-Gaussianity/asymmetry in the WMAP data. Considering the full sky we find results which are consistent with the Gaussian assumption. However, strong non-Gaussian features emerge when considering the northern and southern galactic hemisphere separately, particularly on scales between 1 and 5 degrees. Quite interestingly, the maximum non-Gaussianity is found for hemispheres centered near the ecliptic poles, which might suggest the presence of some systematic effect. The direction of the asymmetry seems consistent with the findings by Eriksen et al. 2004. Subject headings: (cosmology:) cosmic microwave background — cosmology: observations — methods: data analysis — methods: statistica

Year: 2004
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