Asymmetries in the local curvature of the WMAP data

Preprint

17 February 2004

preprint
Published by arXiv in arXiv

https://doi.org/10.48550/arXiv.astro-ph/0402396

Abstract

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.

Keywords

HEMISPHERE SEPARATELY
GALACTIC HEMISPHERE
SOUTHERN GALACTIC
LOCAL CURVATURE
WMAP DATA
ASYMMETRY
GAUSSIAN
FULL SKY

All Related Versions

Version 1, 2004-02-17, ArXiv
Published version: The Astrophysical Journal, 607 (2), L67.

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