Testing the Gaussianity of the COBE-DMR data with spherical wavelets

Дата и время публикации : 2000-04-14T14:12:22Z

Авторы публикации и институты :
R. B. Barreiro
M. P. Hobson
A. N. Lasenby
A. J. Banday
K. M. Gorski
G. Hinshaw

Оригинал статьи :http://arxiv.org/abs/astro-ph/0004202v1

Скачать pdf : http://arxiv.org/pdf/astro-ph/0004202v1

Ссылка на журнал-издание: Mon.Not.Roy.Astron.Soc. 318 (2000) 475
Коментарии к статье: latex file 7 pages, 6 figures, submitted to MNRAS
Первичная категория: astro-ph

Все категории : astro-ph

Краткий обзор статьи: 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 $> 99$ 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.

Category: Physics