Needlet Bispectrum Asymmetries in the WMAP 5-year Data

Details Needlet Bispectrum Asymmetries in the WMAP 5-year Data Needlet Bispectrum Asymmetries in the WMAP 5-year Data

2009-05-22

arxiv.org/abs/0905.3702v2

MNRAS 2009 L367

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

Published on MNRAS letters

Scientific paper

We apply the needlet formalism to the Wilkinson Microwave Anisotropy Probe 5-year data, looking for evidence of non-Gaussianity in the bispectrum of the needlet amplitudes. We confirm earlier findings of an asymmetry in the non-Gaussianity between the northern and southern galactic hemispheres. We attempt to isolate which scales and geometrical configurations are most anomalous, and find the bispectrum is most significant on large scales and in the more co-linear configurations, and also in the `squeezed' configurations. However, these anomalies do not appear to affect the estimate of the non-linear parameter $\fnl$, and we see no significant difference between its value measured in the two hemispheres.

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