Scalar quantities as detectors of non-Gaussianity on CMB maps

Details Scalar quantities as detectors of non-Gaussianity on CMB maps Scalar quantities as detectors of non-Gaussianity on CMB maps

2006-04-17

arxiv.org/abs/astro-ph/0604356v3

Mon.Not.Roy.Astron.Soc.371:312-322,2006

Astronomy and Astrophysics

Astrophysics

Accepted for publication in MNRAS. 13 pages, 3 figures

Scientific paper

10.1111/j.1365-2966.2006.10653.x

We study the power of several scalar quantities constructed on the sphere (presented in Monteserin et al. 2005) to detect non-Gaussianity on the temperature distribution of the cosmic microwave background (CMB). The test has been performed using non-Gaussian CMB simulations with injected skewness or kurtosis generated through the Edgeworth expansion. We have also taken into account in the analysis the effect of anisotropic noise and the presence of a Galactic mask. We find that the best scalars to detect an excess of skewness in the simulations are the derivative of the gradient, the fractional isotropy, the Laplacian and the shape index. For the kurtosis case, the fractional anisotropy, the Laplacian and the determinant are the quantities that perform better.

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