Journal
ASTRONOMY & ASTROPHYSICS
Volume 464, Issue 1, Pages 405-415Publisher
EDP SCIENCES S A
DOI: 10.1051/0004-6361:20042230
Keywords
cosmology : cosmic microwave background; polarization
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Measurement of cosmic microwave background polarization is today a major goal of observational cosmology. The level of the signal to measure, however, makes it very sensitive to various systematic effects. In the case of Planck, which measures polarization by combining data from various detectors, the beam asymmetry can induce a conversion of temperature signals to polarization signals or a polarization mode mixing. In this paper, we investigate this effect using realistic simulated beams and propose a first-order method to correct the polarization power spectra for the induced systematic effect.
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