Journal
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Volume 485, Issue 2, Pages 2355-2366Publisher
OXFORD UNIV PRESS
DOI: 10.1093/mnras/stz557
Keywords
instrumentation: polarimeters; techniques: polarimetric
Categories
Funding
- 'RoboPol' project under the 'Aristeia' Action of the 'Operational Programme Education and Lifelong Learning'
- European Social Fund (ESF)
- Greek National Resources
- European Comission [PCIG10-GA-2011-304001 'JetPop', PIRSES-GA-2012-31578 'EuroCal']
- NASA [NNX11A043G]
- NSF [AST-1109911]
- Polish National Science Centre [2011/01/B/ST9/04618, 2017/25/B/ST9/02805]
- European Commission Seventh Framework Programme (FP7) through the Marie Curie Career Integration Grant [PCIG-GA-2011-293531 'SFOnset']
- National Science Foundation [AST-1611547]
- European Research Counsil under the European Union's Horizon 2020 research and innovation programme [771282]
- International Fulbright Science and Technology Award
- International Max Planck Research School (IMPRS) for Astronomy and Astrophysics at the University of Bonn
- International Max Planck Research School (IMPRS) for Astronomy and Astrophysics at the University of Cologne
- Academy of Finland [317383]
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We present the design and performance of RoboPol, a four-channel optical polarimeter operating at the Skinakas Observatory in Crete, Greece. RoboPol is capable of measuring both relative linear Stokes parameters q and u (and the total intensity I) in one sky exposure. Though primarily used to measure the polarization of point sources in the R band, the instrument features additional filters (B, V, and I), enabling multiwavelength imaging polarimetry over a large field of view (13.6' x 13.6'). We demonstrate the accuracy and stability of the instrument throughout its 5 yr of operation. Best performance is achieved within the central region of the field of view and in the R band. For such measurements the systematic uncertainty is below 0.1 per cent in fractional linear polarization, p (0.05 per cent maximum likelihood). Throughout all observing seasons the instrumental polarization varies within 0.1 per cent in p and within similar to 1 degrees in polarization angle.
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