Calibration and performance of NIKA2
The performance of the NIKA2 camera at the IRAM 30-m telescope have been assessed using a reference data set including observations acquired between January 2017 and February 2018. This data set consists of a large amount of observations of primary and secondary calibrators and faint sources, which span the whole range of observing elevations and atmospheric conditions encountered at the IRAM 30-m telescope. Using the reference data set, the stability of the performance parameters have been extensively tested against time evolution and observing conditions.
The performance assessment relies on a standard calibration method, referred to as the 'baseline' method, that goes from raw data to flux density measurements. This method includes the determination of the KID positions in the sky, the KID selection, the characterisation of the beam pattern, the atmospheric opacity estimation, the calibration of the absolute scale of the flux density, the flat fielding and the point source photometry. Alternative calibration methods have also been used to check the robustness of the 'baseline' results against systematic effects.
I will present the calibration method, which is currently used for the science data calibration, and will review the performance assessment.