Asymmetric Beams and CMB Statistical Anisotropy

Details Asymmetric Beams and CMB Statistical Anisotropy Asymmetric Beams and CMB Statistical Anisotropy

2010-02-28

arxiv.org/abs/1003.0198v2

Phys.Rev.D81:103003,2010

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

updated to match PRD version + typo correction in Eq. B3

Scientific paper

10.1103/PhysRevD.81.103003

Beam asymmetries result in statistically-anisotropic cosmic microwave background (CMB) maps. Typically, they are studied for their effects on the CMB power spectrum, however they more closely mimic anisotropic effects such as gravitational lensing and primordial power asymmetry. We discuss tools for studying the effects of beam asymmetry on general quadratic estimators of anisotropy, analytically for full-sky observations as well as in the analysis of realistic data. We demonstrate this methodology in application to a recently-detected 9 sigma quadrupolar modulation effect in the WMAP data, showing that beams provide a complete and sufficient explanation for the anomaly.

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