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We analyze the alignment of the low multipoles (quadrupole and octupole) ofvarious maps of the WMAP 5yr release: the CMB maps obtained with ILC and MCMCmethods, the CMB map in the V band after foreground reduction, and, forcomparison, the (not cleaned) V band map. We study how much this alignment ispolluted by residuals on the Galactic region. Among the considered maps, theWMAP-ILC turns out to be the most clean map from the point of view of theproposed test. This result has been found studying the redistribution (due tothe masking process) of each bin of the probability distribution functions ofthe alignment estimators. By construction, our method, feasible through MonteCarlo simulations, works for any possible mask adopted in the analysis of datafrom current and forthcoming CMB anisotropy experiments and it can only excludethat the considered map is clean.

Large scale alignment anomalies of CMB anisotropies: a new test for residuals applied to WMAP 5yr maps