Polarimetry at millimeter wavelengths with the NIKA camera: calibration and performance

被引:28
作者
Ritacco, A. [1 ]
Ponthieu, N.
Catalano, A. [1 ]
Adam, R. [1 ,2 ]
Ande, P. [3 ]
Andre, P. [4 ]
Beelen, A. [4 ,5 ,6 ]
Benoit, A. [7 ,8 ]
Bideaud, A. [7 ,8 ]
Billot, N. [9 ]
Bourrion, O. [1 ]
Calvo, M. [7 ,8 ]
Coiffard, G. [10 ]
Comis, B. [1 ]
Desert, F. -X. [11 ]
Doyle, S.
Goupy, J. [7 ,8 ]
Kramer, C. [9 ]
Leclercq, S. [10 ]
Macias-Perez, J. F. [1 ]
Mauskopf, P. [3 ,12 ,13 ]
Maury, A. [4 ]
Mayet, F. [1 ]
Monfardini, A. [7 ,8 ]
Pajot, F. [5 ,6 ]
Pascale, E. [3 ]
Perotto, L. [1 ]
Pisano, G. [3 ]
Rebolo-Iglesias, M. [1 ]
Reveret, V. [4 ]
Rodriguez, L. [4 ]
Romero, C. [10 ]
Ruppin, F. [1 ]
Savini, G. [14 ]
Schuster, K. [10 ]
Sievers, A. [9 ]
Thum, C. [9 ]
Triqueneaux, S. [7 ,8 ]
Tucker, C. [3 ]
Zylka, R. [10 ]
机构
[1] Univ Grenoble Alpes, CNRS, IN2P3, Lab Phys Subatom & Cosmol, 53 Ave Martyrs, F-38000 Grenoble, France
[2] Univ Cote Azur, CNRS, Lab Lagrange, Observ Cote Azur, Bvd Observ,CS 34229, F-06304 Nice 4, France
[3] Cardiff Univ, Astron Instrumentat Grp, Cardiff CF10 3AT, S Glam, Wales
[4] Univ Paris Diderot, CNRS, INSU, Lab AIM,CEA,IRFU,CEA Saclay, F-91191 Gif Sur Yvette, France
[5] CNRS, Inst Astrophys Spatiale IAS, F-91405 Orsay, France
[6] Univ Paris Sud, F-91405 Orsay, France
[7] CNRS, Inst Neel, F-38000 Grenoble, France
[8] Univ Grenoble Alpes, F-38000 Grenoble, France
[9] Inst RadioAstron Millimetr IRAM, Granada 18012, Spain
[10] Inst RadioAstronomie Millimetr IRAM, F-38000 Grenoble, France
[11] Univ Grenoble Alpes, CNRS, IPAG, F-38000 Grenoble, France
[12] Arizona State Univ, Sch Earth & Space Explorat, Tempe, AZ 85287 USA
[13] Arizona State Univ, Dept Phys, Tempe, AZ 85287 USA
[14] UCL, Dept Phys & Astron, Gower St, London WC1E 6BT, England
基金
欧洲研究理事会;
关键词
ISM: magnetic fields; polarization; ISM: clouds; instrumentation: polarimeters; MICROWAVE BACKGROUND ASTRONOMY; HALF-WAVE PLATE; SUBMILLIMETER INSTRUMENTS; 1ST DETECTION; CYGNUS-A; 3C; 273; POLARIZATION; TELESCOPE; EMISSION; SCIENCE;
D O I
10.1051/0004-6361/201629666
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
Magnetic fields, which play a major role in a large number of astrophysical processes can be traced via observations of dust polarization. In particular, Planck low-resolution observations of dust polarization have demonstrated that Galactic filamentary structures, where star formation takes place, are associated to well organized magnetic fields. A better understanding of this process requires detailed observations of galactic dust polarization on scales of 0.01 to 0.1 pc. Such high-resolution polarization observations can be carried out at the IRAM 30 m telescope using the recently installed NIKA2 camera, which features two frequency bands at 260 and 150 GHz (respectively 1.15 and 2.05 mm), the 260 GHz band being polarization sensitive. NIKA2 so far in commissioning phase, has its focal plane filled with similar to 3300 detectors to cover a Field of View (FoV) of 6.5 arcmin diameter. The NIKA camera, which consisted of two arrays of 132 and 224 Lumped Element Kinetic Inductance Detectors (LEKIDs) and a FWHM (Full-Width-Half-Maximum) of 12 and 18.2 arcsec at 1.15 and 2.05 mm respectively, has been operated at the IRAM 30 m telescope from 2012 to 2015 as a test-bench for NIKA2. NIKA was equipped of a room temperature polarization system (a half wave plate (HWP) and a grid polarizer facing the NIKA cryostat window). The fast and continuous rotation of the HWP permits the quasi simultaneous reconstruction of the three Stokes parameters, I, Q, and U at 150 and 260 GHz. This paper presents the first polarization measurements with KIDs and reports the polarization performance of the NIKA camera and the pertinence of the choice of the polarization setup in the perspective of NIKA2. We describe the polarized data reduction pipeline, specifically developed for this project and how the continuous rotation of the HWP permits to shift the polarized signal far from any low frequency noise. We also present the dedicated algorithm developed to correct systematic leakage e ff ects. We report results on compact and extended sources obtained during the February 2015 technical campaign. These results demonstrate a good understanding of polarization systematics and state-of-the-art performance in terms of photometry, polarization degree and polarization angle reconstruction.
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页数:17
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