Searching for planar signatures in WMAP
L. Raul Abramo, Armando Bernui, Thiago S. Pereira

TL;DR
This study investigates planar deviations in WMAP CMB data using angular-planar statistics, revealing anomalies likely caused by residual foreground contamination and highlighting the importance of foreground removal procedures.
Contribution
The paper applies a novel angular-planar statistical method to WMAP data, analyzing the impact of foreground cleaning and masking on detected anisotropies in the CMB.
Findings
Full-sky maps show anomalies at (l,ell)=(2,5),(4,7),(6,8) due to residual foregrounds.
Masked maps reveal anomalies at (10,8) and (2,9), suggesting foreground cleaning may hide or create anomalies.
A persistent anomaly at (10,5) indicates possible residual contamination aligned with the galaxy's plane.
Abstract
We search for planar deviations of statistical isotropy in the Wilkinson Microwave Anisotropy Probe (WMAP) data by applying a recently introduced angular-planar statistics both to full-sky and to masked temperature maps, including in our analysis the effect of the residual foreground contamination and systematics in the foreground removing process as sources of error. We confirm earlier findings that full-sky maps exhibit anomalies at the planar () and angular () scales and , which seem to be due to unremoved foregrounds since this features are present in the full-sky map but not in the masked maps. On the other hand, our test detects slightly anomalous results at the scales and in the masked maps but not in the full-sky one, indicating that the foreground cleaning procedure (used to generate the full-sky map) could not…
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