期刊
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
卷 437, 期 3, 页码 2772-2789出版社
OXFORD UNIV PRESS
DOI: 10.1093/mnras/stt2090
关键词
magnetic fields; polarization; balloons; instrumentation: polarimeters; techniques: polarimetric; submillimetre: ISM
资金
- NASA [NAG5-12785, NAG5-13301, NNGO-6GI11G]
- Canadian Space Agency (CSA)
- Science and Technology Facilities Council (STFC)
- Canada's Natural Sciences and Engineering Research Council (NSERC)
- Canada Foundation for Innovation
- Ontario Innovation Trust
- Puerto Rico Space Grant Consortium
- Fondo Institucional para la Investigacion of the University of Puerto Rico
- National Science Foundation Office of Polar Programs
- Canadian Institute for Advanced Research
A cryogenic achromatic half-wave plate (HWP) for submillimetre astronomical polarimetry has been designed, manufactured, tested and deployed in the Balloon-borne Large-Aperture Submillimeter Telescope for Polarimetry (BLASTPol). The design is based on the five-slab Pancharatnam recipe and it works in the wavelength range 200-600 mu m, making it the broadest-band HWP built to date at (sub)millimetre wavelengths. The frequency behaviour of the HWP has been fully characterized at room and cryogenic temperatures with incoherent radiation from a polarizing Fourier transform spectrometer. We develop a novel empirical model, complementary to the physical and analytical ones available in the literature, that allows us to recover the HWP Mueller matrix and phase shift as a function of frequency and extrapolated to 4 K. We show that most of the HWP non-idealities can be modelled by quantifying one wavelength-dependent parameter, the position of the HWP equivalent axes, which is then readily implemented in a map-making algorithm. We derive this parameter for a range of spectral signatures of input astronomical sources relevant to BLASTPol, and provide a benchmark example of how our method can yield improved accuracy on measurements of the polarization angle on the sky at submillimetre wavelengths.
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