Journal
PHYSICAL REVIEW D
Volume 81, Issue 10, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevD.81.103003
Keywords
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Funding
- NASA Office of Space Science
- STFC [ST/F002998/1, ST/G00269X/1] Funding Source: UKRI
- Science and Technology Facilities Council [ST/F002998/1, PP/C001214/2, ST/H00243X/1, ST/G00269X/1] Funding Source: researchfish
- UK Space Agency [ST/H00002X/1] Funding Source: researchfish
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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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