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Searching for non-Gaussianity in the Planck data

Published online by Cambridge University Press:  01 July 2015

Marcelo J. Rebouças
Affiliation:
Centro Brasileiro de Pesquisas Físicas, Rua Dr. Xavier Sigaud 150, 22290-180 Rio de Janeiro – RJ, Brazil email: reboucas@cbpf.br
Armando Bernui
Affiliation:
Observatório Nacional Rua General José Cristino 77, 20921-400 Rio de Janeiro – RJ, Brazil email: bernui@on.br
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Abstract

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The statistical properties of the temperature anisotropies and polarization of the of cosmic microwave background (CMB) radiation offer a powerful probe of the physics of the early universe. In recent works a statistical procedure based upon the calculation of the kurtosis and skewness of the data in patches of CMB sky-sphere has been proposed and used to investigate the large-angle deviation from Gaussianity in WMAP maps. Here we briefly address the question as to how this analysis of Gaussianity is modified if the foreground-cleaned Planck maps are considered. We show that although the foreground-cleaned Planck maps present significant deviation from Gaussianity of different degrees when a less severe mask is used, they become consistent with Gaussianity, as detected by our indicators, when masked with the union mask U73.

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