PhysRevD.81.103003.pdf (197.03 kB)
Asymmetric beams and CMB statistical anisotropy
journal contribution
posted on 2023-06-08, 07:48 authored by Duncan Hanson, Antony LewisAntony Lewis, Anthony ChallinorBeam 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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- Published
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Journal
Physical Review DISSN
1550-7998Publisher
American Physical SocietyExternal DOI
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10Volume
81Department affiliated with
- Physics and Astronomy Publications
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Article Number: 103003Full text available
- Yes
Peer reviewed?
- Yes
Legacy Posted Date
2012-02-06First Open Access (FOA) Date
2016-03-22First Compliant Deposit (FCD) Date
2016-11-10Usage metrics
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