Beam deconvolution in noisy CMB maps

Abstract

The subject of this paper is beam deconvolution in small angular scale CMB experiments. The beam effect is reversed using the Jacobi iterative method, which was designed to solved systems of algebraic linear equations. The beam is a non circular one which moves according to the observational strategy. A certain realistic level of Gaussian instrumental noise is assumed. The method applies to small scale CMB experiments in general (cases A and B), but we have put particular attention on Planck mission at 100 GHz (cases C and D). In cases B and D, where noise is present, deconvolution allows to correct the main beam distortion effect and recover the initial angular power spectrum up to the end of the fifth acoustic peak. An encouraging result whose importance is analyzed in detail. More work about deconvolution in the presence of other systematics is in progress. This paper is related to the Planck LFI activities.

24 pages, 9 figures. submitted to Astronomy and Astrophysics

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• Iterative destriping and photometric calibration for Planck-HFI, polarized, multi-detector map-making
• Beam deconvolution in noisy CMB maps
• Trade-off between angular resolution and straylight contamination in CMB anisotropy experiments. II. Straylight evaluation
• Asymfast, a method for convolving maps with asymmetric main beams
• Data analysis methods for the cosmic microwave background
• Likelihood, Fisher information, and systematics of cosmic microwave background experiments
• CMB maps lensed by cosmological structures: Simulations and statistical analysis
• A multifrequency angular power spectrum analysis of the Leiden polarization surveys
• Estimating small angular scale CMB anisotropy with high resolution N-body simulations: weak lensing
• Expanded Generalized Needlet Internal Linear Combination (eGNILC) Framework for the 21-cm Foreground Removal
• Making Maps from Planck LFI 30GHz Data with Asymmetric Beams and Cooler Noise