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Zero-polarization c...
Zero-polarization candidate regions for the calibration of wide-field optical polarimeters
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- Mandarakas, N. (author)
- Panepistimio Kritis,University of Crete
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- Panopoulou, Georgia Virginia, 1989 (author)
- Chalmers tekniska högskola,Chalmers University of Technology
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- Pelgrims, V. (author)
- Université libre de Bruxelles (ULB)
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- Potter, S. B. (author)
- South African Astronomical Observatory,University of Johannesburg
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- Pavlidou, V. (author)
- Panepistimio Kritis,University of Crete
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- Ramaprakash, A. N. (author)
- California Institute of Technology (Caltech),Inter-University Centre for Astronomy and Astrophysics (IUCAA)
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- Tassis, Konstantinos (author)
- Panepistimio Kritis,University of Crete
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Blinov, D. (author)
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Kiehlmann, S. (author)
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- Koutsiona, E. (author)
- Panepistimio Kritis,University of Crete
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- Maharana, S. (author)
- South African Astronomical Observatory
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- Romanopoulos, S. (author)
- Panepistimio Kritis,University of Crete
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- Skalidis, R. (author)
- California Institute of Technology (Caltech)
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- Vervelaki, A. (author)
- Panepistimio Kritis,University of Crete
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- Clark, S. E. (author)
- Stanford University
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- Kypriotakis, J. A. (author)
- Panepistimio Kritis,University of Crete
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- Readhead, A. C.S. (author)
- California Institute of Technology (Caltech)
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(creator_code:org_t)
- 2024
- 2024
- English.
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In: Astronomy and Astrophysics. - 0004-6361 .- 1432-0746. ; 684
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https://doi.org/10.1...
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Abstract
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- Context. The calibration of optical polarimeters relies on the use of stars with negligible polarization (i.e., unpolarized standard stars) for determining the instrumental polarization zero point. For wide-field polarimeters, calibration is often done by imaging the same star over multiple positions in the field of view (FoV), which is a time-consuming process. A more effective technique is to target fields containing multiple standard stars. While this method has been used for fields with highly polarized stars, there are no such sky regions with well measured unpolarized standard stars. Aims. We aim to identify sky regions with tens of stars exhibiting negligible polarization that are suitable for a zero-point calibration of wide-field polarimeters. Methods. We selected stars in regions with extremely low reddening, located at high Galactic latitudes. We targeted four ∼40′ × 40′ fields in the northern and eight in the southern equatorial hemispheres. Observations were carried out at the Skinakas Observatory and the South African Astronomical Observatory. Results. We found two fields in the north and seven in the south characterized by a mean polarization lower than p < 0.1%. Conclusions. At least 9 out of the 12 fields can be used for a zero-point calibration of wide-field polarimeters.
Subject headings
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
- NATURVETENSKAP -- Fysik -- Atom- och molekylfysik och optik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Atom and Molecular Physics and Optics (hsv//eng)
Keyword
- polarization
- ISM: general
- methods: observational
- catalogs
- techniques: polarimetric
Publication and Content Type
- art (subject category)
- ref (subject category)
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- By the author/editor
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Mandarakas, N.
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Panopoulou, Geor ...
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Pelgrims, V.
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Potter, S. B.
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Pavlidou, V.
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Ramaprakash, A. ...
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show more...
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Tassis, Konstant ...
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Blinov, D.
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Kiehlmann, S.
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Koutsiona, E.
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Maharana, S.
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Romanopoulos, S.
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Skalidis, R.
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Vervelaki, A.
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Clark, S. E.
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Kypriotakis, J. ...
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Readhead, A. C.S ...
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show less...
- About the subject
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Physical Science ...
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and Astronomy Astrop ...
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Physical Science ...
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and Atom and Molecul ...
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Astronomy and As ...
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Chalmers University of Technology