Testing the Gaussianity of the COBE-DMR data with spherical wavelets
Abstract
We investigate the Gaussianity of the 4-year COBE-DMR data (in HEALPix pixelisation) using an analysis based on spherical Haar wavelets. We use all the pixels lying outside the Galactic cut and compute the skewness, kurtosis and scale-scale correlation spectra for the wavelet coefficients at each scale. We also take into account the sensitivity of the method to the orientation of the input signal. We find a detection of non-Gaussianity at per cent level in just one of our statistics. Taking into account the total number of statistics computed, we estimate that the probability of obtaining such a detection by chance for an underlying Gaussian field is 0.69. Therefore, we conclude that the spherical wavelet technique shows no strong evidence of non-Gaussianity in the COBE-DMR data.
Cite
@article{arxiv.astro-ph/0004202,
title = {Testing the Gaussianity of the COBE-DMR data with spherical wavelets},
author = {R. B. Barreiro and M. P. Hobson and A. N. Lasenby and A. J. Banday and K. M. Gorski and G. Hinshaw},
journal= {arXiv preprint arXiv:astro-ph/0004202},
year = {2015}
}
Comments
latex file 7 pages, 6 figures, submitted to MNRAS