Planck early results. III. First assessment of the Low Frequency Instrument in-flight performance
A. Mennella, M. Bersanelli, R. C. Butler, A. Curto, F. Cuttaia, R. J., Davis, J. Dick, M. Frailis, S. Galeotta, A. Gregorio, H. Kurki-Suonio, C. R., Lawrence, S. Leach, J. P. Leahy, S. Lowe, D. Maino, N. Mandolesi, M. Maris,, E. Mart\'inez-Gonz\'alez, P. R. Meinhold, G. Morgante
TL;DR
This paper assesses the in-flight performance of the Planck Low Frequency Instrument after one year, focusing on optical parameters, calibration, noise, and systematic effects, confirming pre-launch expectations.
Contribution
It provides the first comprehensive in-flight performance evaluation of the Planck LFI, validating ground assessments and analyzing systematic effects.
Findings
Optical parameters match ground assessments
Photometric calibration is stable and reliable
Systematic effects are within expected limits
Abstract
The scientific performance of the Planck Low Frequency Instrument (LFI) after one year of in-orbit operation is presented. We describe the main optical parameters and discuss photometric calibration, white noise sensitivity, and noise properties. A preliminary evaluation of the impact of the main systematic effects is presented. For each of the performance parameters, we outline the methods used to obtain them from the flight data and provide a comparison with pre-launch ground assessments, which are essentially confirmed in flight.
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