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We analyze statistical properties of the separate multipole moments of theCMB temperature maps and find that the distribution tails are slightlynon-Gaussian. Moreover, the deviation from Gaussianity peaks sharply at around$l\sim45\pm10$. If the detected non-Gaussianities should be attributed to theremaining foreground contamination from the galactic plane, an appearance of asimilar peak in different frequency bands is unexpected. The presence of thepeak was also confirmed by the analysis of weighted multipoles which is lesssusceptible to the galactic noise. A separate analysis of the multipoles withodd and even $l+m$ shows two opposite types of non-Gaussianities which cannotbe explained with only galactic foregrounds. We argue that cosmic strings orcorrelated gravitational waves could lead to the observed effect.

Non-Gaussianity of the distribution tails in CMB