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Recently, full sky maps from Planck have been made publicly available. Inthis paper, we do consistency tests for the three Planck CMB sky maps. Weassume that the difference between two maps represents the contributions fromsystematics, noise, foregrounds and other sources, and that a preciserepresentation of the Cosmic Microwave Background should be uncorrelated withit. We investigate the cross correlation in pixel space between the differencemaps and the various Planck maps and find no significant correlations, incomparison to 10000 random Gaussian simulated maps. Additionally we investigatethe difference map between the WMAP ILC 9 year map and the ILC 7 year map. Weperform cross correlations between this difference map, and the ILC9 and ILC7,and find significant correlations only for the ILC9, at more than the 99.99%level. Likewise, a comparison between the Planck NILC map and the WMAP ILC9map, shows a strong correlation for the ILC9 map with the difference map, alsoat more than the 99.99% level. Thus the ILC9 appears to be more contaminatedthan the ILC7, which should be taken into consideration when using WMAP mapsfor cosmological analyses.

Consistency tests for Planck and WMAP in the low multipole domain