Summary of LFI data characteristics

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Quantification of the performance of LFI is summarized in Table 1 below. All the details can be found in the LFI data processing paper Planck-2018-l02[1].

Table 1. LFI performance parameters
Parameter 30 GHz 44 GHz 70 GHz
Centre frequency [GHz] 28.4 44.1 70.4
Bandwidth [GHz] 9.89 10.72 14.90
Scanning beam FWHMa [arcmin] 33.10 27.94 13.08
Scanning beam ellipticitya 1.37 1.25 1.27
Effective beam FWHMb [arcmin] 32.29 27.00 13.22
White noise level in timelinesc [μKCMB s1/2] 147.9 174.0 151.9
fkneec [mHz] 113.9 53.0 19.6
1/f slopec -0.92 -0.88 -1.20
Overall calibration uncertaintyd [%] 0.17 0.12 0.20


a Determined by fitting Jupiter observations directly in the timelines.

b Calculated from the main beam solid angle of the effective beam, Ωeff = mean(Ω). These values are used in the source extraction pipeline (Planck-2015-A26[2]).

c Typical values derived from fitting noise spectra

d difference between first and last iteration of the iterative calibration (for 30 and 44 GHz) or E2E 2015 result (for 70 GHz). In 2015 the calibration uncertainity was 0.35% and 0.26% at 30 and 44, respectively.


References[edit]

  1. Planck 2018 results. II. Low Frequency Instrument data processing, Planck Collaboration, accepted by A&A, (2018).
  2. Planck 2015 results. XXVI. The second Planck catalogue of compact sources, Planck Collaboration, 2016, A&A, 594, A26.

(Planck) Low Frequency Instrument

Full-Width-at-Half-Maximum

Cosmic Microwave background