Issue |
A&A
Volume 569, September 2014
|
|
---|---|---|
Article Number | A9 | |
Number of page(s) | 15 | |
Section | Astronomical instrumentation | |
DOI | https://doi.org/10.1051/0004-6361/201423557 | |
Published online | 09 September 2014 |
Performance and calibration of the NIKA camera at the IRAM 30 m telescope
1
Laboratoire de Physique Subatomique et de Cosmologie, Université
Grenoble Alpes, CNRS/IN2P3, 53 rue
des Martyrs, 38026
Grenoble,
France
2
Institut Néel, CNRS and Université de Grenoble,
38042
Grenoble,
France
3
Institut de Planétologie et d’Astrophysique de Grenoble (IPAG),
CNRS and Université de Grenoble, 38041
Grenoble,
France
4
Institut de Radio Astronomie Millimétrique (IRAM),
38406
Grenoble,
France
5 Astronomy Instrumentation Group, University of Cardiff, UK
6
Laboratoire AIM, CEA/IRFU, CNRS/INSU, Université Paris Diderot,
CEA-Saclay, 91191
Gif-Sur-Yvette,
France
7
Institut d’Astrophysique Spatiale (IAS), CNRS and Université Paris
Sud, 91405
Orsay, Cedex France
8
Institut d’Électronique Fondamentale (IEF), Université Paris Sud,
91405
Orsay,
France
9
Institut de Radio Astronomie Millimétrique (IRAM),
18012
Granada,
Spain
10
University College London, Department of Physics and
Astronomy, Gower
Street, London
WC1E 6BT,
UK
11
Università Sapienza di Roma, 00185 Roma Italy
12
SESE and Physics, Arizona State University,
Tempe, AZ, USA
Received:
2
February
2014
Accepted:
20
June
2014
The New IRAM KID Array (NIKA) instrument is a dual-band imaging camera operating with kinetic inductance detectors (KID) cooled at 100 mK. NIKA is designed to observe the sky at wavelengths of 1.25 and 2.14 mm from the IRAM 30 m telescope at Pico Veleta with an estimated resolution of 13 arcsec and 18 arcsec, respectively. This work presents the performance of the NIKA camera prior to its opening to the astrophysical community as an IRAM common-user facility in early 2014. NIKA is a test bench for the final NIKA2 instrument to be installed at the end of 2015. The last NIKA observation campaigns on November 2012 and June 2013 have been used to evaluate this performance and to improve the control of systematic effects. We discuss here the dynamical tuning of the readout electronics to optimize the KID working point with respect to background changes and the new technique of atmospheric absorption correction. These modifications significantly improve the overall linearity, sensitivity, and absolute calibration performance of NIKA. This is proved on observations of point-like sources for which we obtain a best sensitivity (averaged over all valid detectors) of 40 and 14 mJy s1/2 for optimal weather conditions for the 1.25 and 2.14 mm arrays, respectively. NIKA observations of well known extended sources (DR21 complex and the Horsehead nebula) are presented. This performance makes the NIKA camera a competitive astrophysical instrument.
Key words: methods: observational / submillimeter: general / submillimeter: galaxies / submillimeter: ISM
© ESO, 2014
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