A high-significance detection of non-Gaussianity in the WMAP 5-year data using directional spherical wavelets

Details A high-significance detection of non-Gaussianity in the WMAP 5-year data using directional spherical wavelets A high-significance detection of non-Gaussianity in the WMAP 5-year data using directional spherical wavelets

2008-03-14

arxiv.org/abs/0803.2157v2

Mon.Not.Roy.Astron.Soc. 388 (2008) 659-662

Astronomy and Astrophysics

Astrophysics

4 pages, 4 figures, replaced to match version accepted by MNRAS, masks available for download

Scientific paper

10.1111/j.1365-2966.2008.13406.x

We repeat the directional spherical real Morlet wavelet analysis, used to detect non-Gaussianity in the Wilkinson Microwave Anisotropy Probe (WMAP) 1-year and 3-year data (McEwen et al. 2005, 2006a), on the WMAP 5-year data. The non-Gaussian signal detected previously is present in the 5-year data at a slightly increased statistical significance of approximately 99%. Localised regions that contribute most strongly to the non-Gaussian signal are found to be very similar to those detected in the previous releases of the WMAP data. When the localised regions detected in the 5-year data are excluded from the analysis the non-Gaussian signal is eliminated.

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