| Issue |
A&A
Volume 548, December 2012
|
|
|---|---|---|
| Article Number | A110 | |
| Number of page(s) | 15 | |
| Section | Numerical methods and codes | |
| DOI | https://doi.org/10.1051/0004-6361/201220183 | |
| Published online | 30 November 2012 | |
ArtDeco: a beam-deconvolution code for absolute cosmic microwave background measurements⋆
1
University of HelsinkiDepartment of Physics,
PO Box 64
00014,
Helsinki
Finland
e-mail: elina.keihanen@helsinki.fi
2
Max-Planck-Institut für Astrophysik, Karl-Schwarzschild-Str. 1, 85741
Garching,
Germany
e-mail: martin@mpa-garching.mpg.de
Received:
7
August
2012
Accepted:
10
October
2012
We present a method for beam-deconvolving cosmic microwave background (CMB) anisotropy measurements. The code takes as input the time-ordered data along with the corresponding detector pointings and known beam shapes, and produces as output the harmonic aTlm, aElm, and aBlm coefficients of the observed sky. From these one can derive temperature and Q and U polarisation maps. The method is applicable to absolute CMB measurements with wide sky coverage, and is independent of the scanning strategy. We tested the code with extensive simulations, mimicking the resolution and data volume of Planck 30 GHz and 70 GHz channels, but with exaggerated beam asymmetry. We applied it to multipoles up to l = 1700 and examined the results in both pixel space and harmonic space. We also tested the method in presence of white noise.
Key words: cosmic background radiation / methods: data analysis / methods: numerical
The code is released under the terms of the GNU General Public License and can be obtained from http://sourceforge.net/projects/art-deco/
© ESO, 2012
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