Non-Gaussian signatures in the five-year WMAP data as identified with isotropic scaling indices

@article{Rossmanith2009NonGaussianSI,
  title={Non-Gaussian signatures in the five-year WMAP data as identified with isotropic scaling indices},
  author={Gregor Johannes Rossmanith and Christoph W. Raeth and Anthony J. Banday and Gregor Eugen Morfill},
  journal={Monthly Notices of the Royal Astronomical Society},
  year={2009},
  volume={399},
  pages={1921-1933}
}
We continue the analysis of non-Gaussianities in the cosmic microwave background by means of the scaling index method by applying this method on the single Q, V, W bands and the co-added VW band of the five-year data of the Wilkinson Microwave Anisotropy Probe. We compare each of the results with 1000 Monte Carlo simulations mimicking the Gaussian properties of the best fitting A cold dark matter model. Based on the scaling indices, scale-dependent empirical probability distributions, moments… 

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References

SHOWING 1-10 OF 99 REFERENCES
A Scaling Index Analysis of the WMAP three year data: Signatures of non-Gaussianities and Asymmetries in the CMB
Local scaling properties of the co-added foreground-cleaned three-year Wilkinson Microwave Anisotropy Probe (WMAP) data are estimated using weighted scaling in- dices α. The scaling index method
A scaling index analysis of the Wilkinson Microwave Anisotropy Probe three-year data: signatures of non-Gaussianities and asymmetries in the cosmic microwave background
Local scaling properties of the co-added foreground-cleaned three-year Wilkinson Microwave Anisotropy Probe (WMAP) data are estimated using weighted scaling indices a. The scaling index method is -
Detection of Non-Gaussianity in the Wilkinson Microwave Anisotropy Probe First-Year Data Using Spherical Wavelets
TLDR
The non-Gaussian detection in the Wilkinson Microwave Anisotropy Probe (WMAP) first-year data implies not only asymmetries north/south—like other previous WMAP analyses—but also a direct non- Gaussian detection.
Wavelets and WMAP non-Gaussianity
We study the statistical properties of the first-year Wilkinson Microwave Anisotropy Probe (WMAP) data on different scales using the spherical Mexican hat wavelet transform. Consistent with the 2004
Testing for Non-Gaussianity in the Wilkinson Microwave Anisotropy Probe Data: Minkowski Functionals and the Length of the Skeleton
The three Minkowski functionals and the recently defined length of the skeleton are estimated for the co-added first-year Wilkinson Microwave Anisotropy Probe (WMAP) data and compared with 5000 Monte
Asymmetries in the Cosmic Microwave Background Anisotropy Field
We report on the results from two independent but complementary statistical analyses of the Wilkinson Microwave Anisotropy Probe (WMAP) first-year data, based on the power spectrum and N-point
Detection of non-Gaussianity in the WMAP 1-year data using spherical wavelets
TLDR
A non-Gaussian detection in the WMAP 1-year data is reported and the expected foreground contribution to the combined WMAP map was added to CMB Gaussian simulations showing a behaviour compatible with the Gaussian model.
Wavelets and Wilkinson Microwave Anisotropy Probe Non-Gaussianity
We study the statistical properties of the first-year Wilkinson Microwave Anisotropy Probe (WMAP) data on different scales using the spherical Mexican hat wavelet transform. Consistent with the 2004
Non-Gaussianity of the Derived Maps from the First-Year Wilkinson Microwave Anisotropy Probe Data
We present non-Gaussianity testing on derived maps from the recently released first-year Wilkinson Microwave Anisotropy Probe data by Tegmark, de Oliveria-Costa, & Hamilton. Our test is based on a
Departure from Gaussianity of the Cosmic Microwave Background Temperature Anisotropies in the Three-Year WMAP Data
We test the hypothesis that the temperature of the cosmic microwave background is consistent with a Gaussian random field defined on the celestial sphere, using the full sky debiased internal linear
...
...