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Astronomy and Astrophysics 464 (2007) 405-415
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Beam mismatch effects in Cosmic Microwave Background polarization measurements
C. Rosset1, 2, V. Yurchenko3, J. Delabrouille1, J. Kaplan1, Y. Giraud-Héraud1, J.-M. Lamarre4, A. J. Murphy3

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.
1 :  APC - UMR 7164 - AstroParticule et Cosmologie
2 :  LAL - Laboratoire de l'Accélérateur Linéaire
3 :  Experimental Physics Department
4 :  LERMA - Laboratoire d'Etude du Rayonnement et de la Matière en Astrophysique
APC - Cosmologie et Gravitation
Physique/Astrophysique/Cosmologie et astrophysique extra-galactique

Planète et Univers/Astrophysique/Cosmologie et astrophysique extra-galactique

Planète et Univers/Astrophysique
cosmology – cosmic microwave background – polarization
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2230beam.ps(4.8 MB)
2230beam.pdf(1.7 MB)