We present a description of the pipeline used to calibrate the Planck Low Frequency Instrument (LFI) timelines into thermodynamic temperatures for the Planck 2015 data release, covering four years of uninterrupted operations. As in the 2013 data release, our calibrator is provided by the spin-synchronous modulation of the cosmic microwave background dipole, but we now use the orbital component, rather than adopting the Wilkinson Microwave Anisotropy Probe (WMAP) solar dipole. This allows our 2015 LFI analysis to provide an independent Solar dipole estimate, which is in excellent agreement with that of HFI and within 1σ (0.3% in amplitude) of the WMAP value. This 0.3% shift in the peak-to-peak dipole temperature from WMAP and a general overhaul of the iterative calibration code increases the overall level of the LFI maps by 0.45% (30 GHz), 0.64% (44 GHz), and 0.82% (70 GHz) in temperature with respect to the 2013 Planck data release, thus reducing the discrepancy with the power spectrum measured by WMAP. We estimate that the LFI calibration uncertainty is now at the level of 0.20% for the 70 GHz map, 0.26% for the 44 GHz map, and 0.35% for the 30 GHz map. We provide a detailed description of the impact of all the changes implemented in the calibration since the previous data release.

Ade, P., Aghanim, N., Ashdown, M., Aumont, J., Baccigalupi, C., Banday, A., et al. (2016). Planck 2015 results: V. LFI calibration. ASTRONOMY & ASTROPHYSICS, 594 [10.1051/0004-6361/201526632].

Planck 2015 results: V. LFI calibration

NATI, FEDERICO;
2016

Abstract

We present a description of the pipeline used to calibrate the Planck Low Frequency Instrument (LFI) timelines into thermodynamic temperatures for the Planck 2015 data release, covering four years of uninterrupted operations. As in the 2013 data release, our calibrator is provided by the spin-synchronous modulation of the cosmic microwave background dipole, but we now use the orbital component, rather than adopting the Wilkinson Microwave Anisotropy Probe (WMAP) solar dipole. This allows our 2015 LFI analysis to provide an independent Solar dipole estimate, which is in excellent agreement with that of HFI and within 1σ (0.3% in amplitude) of the WMAP value. This 0.3% shift in the peak-to-peak dipole temperature from WMAP and a general overhaul of the iterative calibration code increases the overall level of the LFI maps by 0.45% (30 GHz), 0.64% (44 GHz), and 0.82% (70 GHz) in temperature with respect to the 2013 Planck data release, thus reducing the discrepancy with the power spectrum measured by WMAP. We estimate that the LFI calibration uncertainty is now at the level of 0.20% for the 70 GHz map, 0.26% for the 44 GHz map, and 0.35% for the 30 GHz map. We provide a detailed description of the impact of all the changes implemented in the calibration since the previous data release.
Articolo in rivista - Articolo scientifico
Cosmic background radiation; Instrumentation: polarimeters; Methods: data analysis;
Cosmic background radiation; Instrumentation: polarimeters; Methods: data analysis; Astronomy and Astrophysics; Space and Planetary Science
English
2016
594
A5
open
Ade, P., Aghanim, N., Ashdown, M., Aumont, J., Baccigalupi, C., Banday, A., et al. (2016). Planck 2015 results: V. LFI calibration. ASTRONOMY & ASTROPHYSICS, 594 [10.1051/0004-6361/201526632].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10281/217347
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