Scalar quantities as detectors of non-Gaussianity in cosmic microwave background maps |
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| Authors: | C Monteserín R B Barreiro E Martínez-González J L Sanz |
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| Institution: | Instituto de Física de Cantabria, CSIC-Universidad de Cantabria, Avda. de los Castros s/n, 39005 Santander, Spain;Dpto. de Física Moderna, Universidad de Cantabria, Avda. de los Castros s/n, 39005 Santander, Spain |
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| Abstract: | We study the power of several scalar quantities constructed on the sphere (presented in Monteserín et al.) to detect non-Gaussianity in 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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| Keywords: | methods: analytical methods: statistical cosmic microwave background |
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