A high-significance detection of non-Gaussianity in the WMAP 5-yr data using directional spherical wavelets |
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| Authors: | J. D. McEwen M. P. Hobson A. N. Lasenby D. J. Mortlock |
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| Affiliation: | Astrophysics Group, Cavendish Laboratory, J. J. Thomson Avenue, Cambridge CB3 0HE;Blackett Laboratory, Imperial College of Science, Technology and Medicine, Prince Consort Road, London SW7 2BW |
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| Abstract: | 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. |
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| Keywords: | methods: data analysis methods: numerical cosmic microwave background |
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