Calibration and Performance of the NIKA2 camera at the IRAM 30-meter Telescope
NIKA2 is a dual-band millimetric continuum camera of 2900 Kinetic Inductance Detectors (KID), operating at \(150\) and \(260\,\rm{GHz}\), installed at the IRAM 30-meter telescope. We present the performance assessment of NIKA2 after one year of observation using a dedicated point-source calibration...
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Veröffentlicht in: | arXiv.org 2020-01 |
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Zusammenfassung: | NIKA2 is a dual-band millimetric continuum camera of 2900 Kinetic Inductance Detectors (KID), operating at \(150\) and \(260\,\rm{GHz}\), installed at the IRAM 30-meter telescope. We present the performance assessment of NIKA2 after one year of observation using a dedicated point-source calibration method, referred to as the \emph{baseline} method. Using a large data set acquired between January 2017 and February 2018 that span the whole range of observing elevations and atmospheric conditions encountered at the IRAM 30-m telescope, we test the stability of the performance parameters. We report an instantaneous field of view (FOV) of 6.5' in diameter, filled with an average fraction of \(84\%\) and \(90\%\) of valid detectors at \(150\) and \(260\,\rm{GHz}\), respectively. The beam pattern is characterized by a FWHM of \(17.6'' \pm 0.1''\) and \(11.1''\pm 0.2''\), and a beam efficiency of \(77\% \pm 2\%\) and \(55\% \pm 3\%\) at \(150\) and \(260\,\rm{GHz}\), respectively. The rms calibration uncertainties are about \(3\%\) at \(150\,\rm{GHz}\) and \(6\%\) at \(260\,\rm{GHz}\). The absolute calibration uncertainties are of \(5\%\) and the systematic calibration uncertainties evaluated at the IRAM 30-m reference Winter observing conditions are below \(1\%\) in both channels. The noise equivalent flux density (NEFD) at \(150\) and \(260\,\rm{GHz}\) are of \(9 \pm 1\, \rm{mJy}\cdot s^{1/2}\) and \(30 \pm 3\, \rm{mJy}\cdot s^{1/2}\). This state-of-the-art performance confers NIKA2 with mapping speeds of \(1388 \pm 174\) and \(111 \pm 11 \,\rm{arcmin}^2\cdot \rm{mJy}^{-2}\cdot \rm{h}^{-1}\) at \(150\) and \(260\,\rm{GHz}\). With these unique capabilities of fast dual-band mapping at high (better that 18'') angular resolution, NIKA2 is providing an unprecedented view of the millimetre Universe. |
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ISSN: | 2331-8422 |
DOI: | 10.48550/arxiv.1910.02038 |