Testing Gaussianity in the WMAP data of OT foreground reduced map

TL;DR

This paper assesses the Gaussianity of the WMAP three-year KQ75 masked map using non-Gaussianity indicators, extending previous analyses to a different foreground cleaning method to understand the statistical nature of the CMB data.

Contribution

It applies a novel non-Gaussianity detection method to the OT WMAP map, providing new insights into the Gaussianity of CMB data with a different foreground removal technique.

Findings

Detected deviations from Gaussianity in the OT WMAP map.

Compared results with previous analyses using different cleaning methods.

Enhanced understanding of foreground removal impact on Gaussianity tests.

Abstract

A considerable effort has recently gone into the study of Gaussianity of cosmic microwave background (CMB) data. Among such attempts, there is one with two non-Gaussianity indicators, proposed by the authors, and used in a search for significant deviation from Gaussianity in the WMAP internal linear combination (ILC) and in the single frequency WMAP maps with the KQ75 mask. Here we extend and complement these results by performing a similar analysis for the de Oliveira-Costa and Tegmark (OT) WMAP three-year $KQ75$ masked map, in which the foreground is reduced through a different statistical cleaning procedure.