We use the local curvature to investigate the possible existence of non-Gaussianity/asymmetry in the Wilkinson Microwave Anisotropy Probe data. Considering the full sky, we find results that 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{\deg and 5\deg. 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. }

Hansen, F., Cabella, P., Marinucci, D., Vittorio, N. (2004). Asymmetries in the Local Curvature of the Wilkinson Microwave Anisotropy Probe Data. THE ASTROPHYSICAL JOURNAL LETTERS, 607, L67-L70 [10.1086/421904].

### Asymmetries in the Local Curvature of the Wilkinson Microwave Anisotropy Probe Data

#### Abstract

We use the local curvature to investigate the possible existence of non-Gaussianity/asymmetry in the Wilkinson Microwave Anisotropy Probe data. Considering the full sky, we find results that 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{\deg and 5\deg. 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. }
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Settore FIS/05 - Astronomia e Astrofisica
English
Con Impact Factor ISI
Cosmology: Cosmic Microwave Background, Cosmology: Observations, Methods: Data Analysis, Methods: Statistical
Hansen, F., Cabella, P., Marinucci, D., Vittorio, N. (2004). Asymmetries in the Local Curvature of the Wilkinson Microwave Anisotropy Probe Data. THE ASTROPHYSICAL JOURNAL LETTERS, 607, L67-L70 [10.1086/421904].
Hansen, F; Cabella, P; Marinucci, D; Vittorio, N
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Utilizza questo identificativo per citare o creare un link a questo documento: `https://hdl.handle.net/2108/30837`
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