Asymmetric beams and CMB statistical anisotropy

Hanson, Duncan, Lewis, Antony and Challinor, Anthony (2010) Asymmetric beams and CMB statistical anisotropy. Physical Review D, 81 (10). ISSN 1550-7998

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Abstract

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.

Item Type: Article
Additional Information: Article Number: 103003
Schools and Departments: School of Mathematical and Physical Sciences > Physics and Astronomy
Depositing User: Antony Lewis
Date Deposited: 06 Feb 2012 20:47
Last Modified: 09 Mar 2017 15:56
URI: http://sro.sussex.ac.uk/id/eprint/28113

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