Beam mismatch effects in Cosmic Microwave Background polarization measurements

Details Beam mismatch effects in Cosmic Microwave Background polarization measurements Beam mismatch effects in Cosmic Microwave Background polarization measurements

2004-10-22

arxiv.org/abs/astro-ph/0410544v2

Astron.Astrophys.464:405-415,2007

Astronomy and Astrophysics

Astrophysics

Accepted by Astronomy & Astrophysics

Scientific paper

10.1051/0004-6361:20042230

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 temperature leakage 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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