Journal Article

A high-significance detection of non-Gaussianity in the <i>WMAP</i> 5-yr data using directional spherical wavelets

J. D. McEwen, M. P. Hobson, A. N. Lasenby and D. J. Mortlock

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 388, issue 2, pages 659-662
Published in print August 2008 | ISSN: 0035-8711
Published online July 2008 | e-ISSN: 1365-2966 | DOI:
A high-significance detection of non-Gaussianity in the WMAP 5-yr data using directional spherical wavelets

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We repeat the directional spherical real Morlet wavelet analysis, used previously to detect non-Gaussianity in the Wilkinson Microwave Anisotropy Probe (WMAP) 1- and 3-yr data, on the WMAP 5-yr data. The non-Gaussian signal detected previously is present in the 5-yr data at a slightly increased statistical significance of approximately 99 per cent. Localized 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 localized regions detected in the 5-yr data are excluded from the analysis, the non-Gaussian signal is eliminated.

Keywords: methods: data analysis; methods: numerical; cosmic microwave background

Journal Article.  2545 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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