RoboPol: A four-channel optical imaging polarimeter

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Journal Title
Journal ISSN
Volume Title
A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
Date
2019-05
Major/Subject
Mcode
Degree programme
Language
en
Pages
12
2355-2366
Series
Monthly Notices of the Royal Astronomical Society, Volume 485, issue 2
Abstract
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 × 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 ∼1◦ in polarization angle.
Description
Keywords
Instrumentation: polarimeters, Techniques: polarimetric
Other note
Citation
Ramaprakash, A N, Rajarshi, C V, Das, H K, Khodade, P, Modi, D, Panopoulou, G, Maharana, S, Blinov, D, Angelakis, E, Casadio, C, Fuhrmann, L, Hovatta, T, Kiehlmann, S, King, O G, Kylafis, N, Kougentakis, A, Kus, A, Mahabal, A, Marecki, A, Myserlis, I, Paterakis, G, Paleologou, E, Liodakis, I, Papadakis, I, Papamastorakis, I, Pavlidou, V, Pazderski, E, Pearson, T J, Readhead, A C S, Reig, P, Słowikowska, A, Tassis, K & Zensus, J A 2019, ' RoboPol : A four-channel optical imaging polarimeter ', Monthly Notices of the Royal Astronomical Society, vol. 485, no. 2, pp. 2355-2366 . https://doi.org/10.1093/mnras/stz557