Beam deconvolution in noisy CMB maps

Details Beam deconvolution in noisy CMB maps Beam deconvolution in noisy CMB maps

2003-04-17

arxiv.org/abs/astro-ph/0304326v1

Astron.Astrophys. 409 (2003) 423-438

Astronomy and Astrophysics

Astrophysics

24 pages, 9 figures. submitted to Astronomy and Astrophysics

Scientific paper

10.1051/0004-6361:20031038

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.

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