Testing the gaussianity of the cobe-dmr data with spherical wavelets
Apr, 20007 pages
Published in:
- Mon.Not.Roy.Astron.Soc. 318 (2000) 475
e-Print:
- astro-ph/0004202 [astro-ph]
View in:
Citations per year
Abstract: (arXiv)
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.References(11)
Figures(0)