期刊
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
卷 371, 期 1, 页码 L50-L54出版社
OXFORD UNIV PRESS
DOI: 10.1111/j.1745-3933.2006.00206.x
关键词
methods : data analysis; methods : numerical; cosmic microwave background
We repeat the directional spherical real Morlet wavelet analysis, used to detect non-Gaussianity in the Wilkinson Microwave Anisotropy Probe (WMAP) 1-yr data, on the WMAP 3-yr data. The non-Gaussian signal previously detected is indeed present in the 3-yr data, although the significance of the detection is reduced. Using our most conservative method for constructing significance measures, we find that the significance of the detection of non-Gaussianity drops from 98.3 +/- 0.4 to 94.9 +/- 0.7 per cent; the significance drops from 99.3 +/- 0.3 to 97.2 +/- 0.5 per cent using a method based on the chi(2) statistic. The wavelet analysis allows us to localize most likely sources of non-Gaussianity on the sky. We detect very similar localized regions in the WMAP 1-yr and 3-yr data, although the regions extracted appear more pronounced in the 3-yr data. When all localized regions are excluded from the analysis, the 3-yr data are consistent with Gaussianity.
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