Elliptical Beams in CMB Temperature and Polarization Anisotropy Experiments: An Analytic Approach

Details Elliptical Beams in CMB Temperature and Polarization Anisotropy Experiments: An Analytic Approach Elliptical Beams in CMB Temperature and Polarization Anisotropy Experiments: An Analytic Approach

2001-07-18

arxiv.org/abs/astro-ph/0107346v2

Phys.Rev. D65 (2002) 063003

Astronomy and Astrophysics

Astrophysics

17 pages, 12 figures. Matches version accepted by PRD: Discussion added on the advantages of introducing a perturbative approa

Scientific paper

10.1103/PhysRevD.65.063003

We present an analytic approach to the estimation of beam asymmetry effects in CMB temperature and linear polarization anisotropy experiments. We derive via perturbative expansions simple and accurate results for the case of an elliptical Gaussian window. Our results are applied to investigate the effect of beam ellipticity in the estimation of full-sky polarization correlation functions and the covariance matrix of power spectra. The relevance of this effect is also discussed by forecasting errors including beam asymmetry for current and future CMB experiments.

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