Non-Gaussianity of the derived maps from the first-year WMAP data
arXiv:astro-ph/0303643 · doi:10.1086/376822
Abstract
We present non-Gaussianity testing on recently-released derived maps from the first-year WMAP data by Tegmark, de Oliveria-Costa and Hamilton. Our test is based on a phase mapping technique which has the advantage of testing non-Gaussianity at separate multipole bands. We show that their foreground-cleaned map is against the random-phase hypothesis at all 4 multipole bands centered around l = 150, 290, 400 and 500. Their Wiener-filtered map, on the other hand, is Gaussian for l < 250, and marginally Gaussian for 224 < l < 350. However, we see the evidence of non-Gaussianity for l > 350 as we detect certain degrees of phase coupling, hence against the random-phase hypothesis. Our phase mapping technique is particularly useful for testing the accuracy of component separation methods.
4 pages, 5 figures, ApJL accepted with minor changes (2 sentences added in the Discussions). High-resolution figures can be obtained from http://www.tac.dk/~chiang/wmap.html
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