UCL Discovery
UCL home » Library Services » Electronic resources » UCL Discovery

Planck 2015 results IV. Low Frequency Instrument beams and window functions

Ade, PAR; Aghanim, N; Ashdown, M; Aumont, J; Baccigalupi, C; Banday, AJ; Barreiro, RB; ... Zonca, A; + view all (2016) Planck 2015 results IV. Low Frequency Instrument beams and window functions. Astronomy and Astrophysics , 594 , Article A4. 10.1051/0004-6361/201525809. Green open access

[thumbnail of aa25809-15.pdf]
Preview
Text
aa25809-15.pdf - Published Version

Download (7MB) | Preview

Abstract

This paper presents the characterization of the in-flight beams, the beam window functions, and the associated uncertainties for the Planck Low Frequency Instrument (LFI). The structure of the paper is similar to that presented in the 2013 Planck release; the main differences concern the beam normalization and the delivery of the window functions to be used for polarization analysis. The in-flight assessment of the LFI main beams relies on measurements performed during observations of Jupiter. By stacking data from seven Jupiter transits, the main beam profiles are measured down to –25 dB at 30 and 44 GHz, and down to –30 dB at 70 GHz. It has been confirmed that the agreement between the simulated beams and the measured beams is better than 1% at each LFI frequency band (within the 20 dB contour from the peak, the rms values are 0.1% at 30 and 70 GHz; 0.2% at 44 GHz). Simulated polarized beams are used for the computation of the effective beam window functions. The error budget for the window functions is estimated from both main beam and sidelobe contributions, and accounts for the radiometer band shapes. The total uncertainties in the effective beam window functions are 0.7% and 1% at 30 and 44 GHz, respectively (at ℓ ≈ 600); and 0.5% at 70 GHz (at ℓ ≈ 1000).

Type: Article
Title: Planck 2015 results IV. Low Frequency Instrument beams and window functions
Open access status: An open access version is available from UCL Discovery
DOI: 10.1051/0004-6361/201525809
Publisher version: http://dx.doi.org/10.1051/0004-6361/201525809
Language: English
Additional information: This version is the version of record. For information on re-use, please refer to the publisher’s terms and conditions.
Keywords: Science & Technology, Physical Sciences, Astronomy & Astrophysics, methods: data analysis, cosmic background radiation, telescopes
UCL classification: UCL
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Space and Climate Physics
URI: https://discovery.ucl.ac.uk/id/eprint/10048433
Downloads since deposit
Loading...
0Downloads
Download activity - last month
Loading...
Download activity - last 12 months
Loading...
Downloads by country - last 12 months
Loading...

Archive Staff Only

View Item View Item