Astronomy and Astrophysics – Astrophysics
Scientific paper
2001-05-07
Mon.Not.Roy.Astron.Soc.326:1243,2001
Astronomy and Astrophysics
Astrophysics
to be published in MNRAs
Scientific paper
10.1111/j.1365-2966.2001.04641.x
The spherical Mexican Hat wavelet is introduced in this paper, with the aim of testing the Gaussianity of the Cosmic Microwave Background temperature fluctuations. Using the information given by the wavelet coefficients at several scales, we have performed several statistical tests on the COBE-DMR maps to search for evidence of non-Gaussianity. Skewness, kurtosis, scale-scale correlations (for two and three scales) and Kolmogorov-Smirnov tests indicate that the COBE-DMR data are consistent with a Gaussian distribution. We have extended the analysis to compare temperature values provided by COBE-DMR data with distributions (obtained from Gaussian simulations) at each pixel and at each scale. The number of pixels with temperature values outside the 95% and the 99% is consistent with that obtained from Gaussian simulations, at all scales. Moreover, the extrema values for COBE-DMR data (maximum and minimum temperatures in the map) are also consistent with those obtained from Gaussian simulations.
Argüeso Francisco
Banday Anthony J.
Cayón Laura
Gallegos Julio E.
Górski Kris M.
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