A high-significance detection of non-Gaussianity in the WMAP 5-year data using directional spherical wavelets
arXiv:0803.2157 · doi:10.1111/j.1365-2966.2008.13406.x
Abstract
We repeat the directional spherical real Morlet wavelet analysis, used to detect non-Gaussianity in the Wilkinson Microwave Anisotropy Probe (WMAP) 1-year and 3-year data (McEwen et al. 2005, 2006a), on the WMAP 5-year data. The non-Gaussian signal detected previously is present in the 5-year data at a slightly increased statistical significance of approximately 99%. Localised regions that contribute most strongly to the non-Gaussian signal are found to be very similar to those detected in the previous releases of the WMAP data. When the localised regions detected in the 5-year data are excluded from the analysis the non-Gaussian signal is eliminated.
4 pages, 4 figures, replaced to match version accepted by MNRAS, masks available for download
References in corpus (7)
- Five-Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Cosmological Interpretation
- Five-Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Data Processing, Sky Maps, and Basic Results
- Detection of primordial non-Gaussianity (fNL) in the WMAP 3-year data at above 99.5% confidence
- A low CMB variance in the WMAP data
- Deviation from Gaussianity in the cosmic microwave background temperature fluctuations
- Real space tests of the statistical isotropy and Gaussianity of the WMAP CMB data
- Probing Non-Gaussianity In The Cosmic Microwave Background Anisotropies: One Point Distribution Function
Cited by in corpus (10)
- Volume Modulus Inflation and the Gravitino Mass Problem
- Signature of Primordial Non-Gaussianity on Matter Power Spectrum
- Primordial Non-Gaussianities of General Multiple Field Inflation
- Cosmological applications of a wavelet analysis on the sphere
- A low CMB variance in the WMAP data
- Anomalous CMB north-south asymmetry
- Complex data processing: fast wavelet analysis on the sphere
- A model-independent test for scale-dependent non-Gaussianities in the CMB
- Searching for non-Gaussianity in the WMAP data
- Constraining Modified Gravity with Large non-Gaussianities