Asymmetries in the Local Curvature of the Wilkinson Microwave Anisotropy Probe Data | Zendy

Frode Hansen | Zendy; P. Cabella | Zendy; Domenico Marinucci | Zendy; N. Vittorio | Zendy

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

Author(s) -

Frode Hansen,

P. Cabella,

Domenico Marinucci,

N. Vittorio

Publication year - 2004

Publication title -

the astrophysical journal

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.376

H-Index - 489

eISSN - 1538-4357

pISSN - 0004-637X

DOI - 10.1086/421904

Subject(s) - cmb cold spot , ecliptic , asymmetry , non gaussianity , curvature , cosmic microwave background , physics , sky , anisotropy , gaussian , astrophysics , northern hemisphere , astronomy , mathematics , geometry , optics , quantum mechanics , solar wind , magnetic field

We use the local curvature to investigate the possible existence ofnon-Gaussianity/asymmetry in the WMAP data. Considering the full sky we findresults which are consistent with the Gaussian assumption. However, strongnon-Gaussian features emerge when considering the northern and southerngalactic hemisphere separately, particularly on scales between 1 and 5 degrees.Quite interestingly, the maximum non-Gaussianity is found for hemispherescentered near the ecliptic poles, which might suggest the presence of somesystematic effect. The direction of the asymmetry seems consistent with thefindings by Eriksen et al. 2004.Comment: Submitted to ApJ Letter

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