2014

North-South non-Gaussian asymmetry in PLANCK CMB maps

Bernui, A., Oliveira, A. F., Pereira, T. S.

Understand

We report the results of a statistical analysis performed with the four foreground-cleaned Planck maps by means of a suitably defined {\it local-variance} estimator.

Our analysis shows a clear dipolar structure in Planck's {\it variance map} pointing in the direction $(l,b) \,\simeq\, (220^{\circ},-32^{\circ})$, thus consistent with the North-South asymmetry phenomenon.
Surprisingly, and contrary to previous findings, removing the CMB quadrupole and octopole makes the asymmetry stronger.
Our results show a maximal statistical significance, of $98.1\%$ CL, in the scales ranging from $\ell=4$ to $\ell=500$.

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