| Issue |
A&A
Volume 675, July 2023
BeyondPlanck: end-to-end Bayesian analysis of Planck LFI
|
|
|---|---|---|
| Article Number | A8 | |
| Number of page(s) | 9 | |
| Section | Cosmology (including clusters of galaxies) | |
| DOI | https://doi.org/10.1051/0004-6361/202243138 | |
| Published online | 28 June 2023 | |
BEYONDPLANCK
VIII. Efficient sidelobe convolution and corrections through spin harmonics
1
Institute of Theoretical Astrophysics, University of Oslo, Blindern, Oslo, Norway
e-mail: mathew.galloway@astro.uio.no
2
Max-Planck-Institut für Astrophysik, Karl-Schwarzschild-Str. 1, 85741 Garching, Germany
3
Dipartimento di Fisica, Università degli Studi di Milano, Via Celoria, 16, Milano, Italy
4
INAF-IASF Milano, Via E. Bassini 15, Milano, Italy
5
INFN, Sezione di Milano, Via Celoria 16, Milano, Italy
6
INAF – Osservatorio Astronomico di Trieste, Via G.B. Tiepolo 11, Trieste, Italy
7
Planetek Hellas, Leoforos Kifisias 44, Marousi, 151 25
Greece
8
Department of Astrophysical Sciences, Princeton University, Princeton, NJ, 08544
USA
9
Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Drive, Pasadena, CA, USA
10
Department of Physics, Gustaf Hällströmin katu 2, University of Helsinki, Helsinki, Finland
11
Helsinki Institute of Physics, University of Helsinki, Gustaf Hällströmin katu 2, Helsinki, Finland
12
Computational Cosmology Center, Lawrence Berkeley National Laboratory, Berkeley, CA, USA
13
Haverford College Astronomy Department, 370 Lancaster Avenue, Haverford, PA, USA
14
Dipartimento di Fisica, Università degli Studi di Trieste, Via A. Valerio 2, Trieste, Italy
Received:
17
January
2022
Accepted:
18
March
2022
We introduce a new formulation of the Conviqt convolution algorithm in terms of spin harmonics, and apply this to the problem of sidelobe correction for BEYONDPLANCK, the first end-to-end Bayesian Gibbs sampling framework for CMB analysis. We compare our implementation to the previous Planck LevelS implementation, and find good agreement between the two codes in terms of accuracy, but with a speed-up reaching a factor of 3–10, depending on the frequency bandlimits, lmax and mmax. The new algorithm is significantly simpler to implement and maintain, since all low-level calculations are handled through an external spherical harmonic transform library. We find that our mean sidelobe estimates for Planck LFI are in good agreement with previous efforts. Additionally, we present novel sidelobe rms maps that quantify the uncertainty in the sidelobe corrections due to variations in the sky model.
Key words: cosmic background radiation / cosmology: observations
© The Authors 2023
Open Access article, published by EDP Sciences, under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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