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Galaxies 2016, 4(4), 52; doi:10.3390/galaxies4040052

Ringo2 Optical Polarimetry of Blazars

1
Astrophysics Research Institute, Liverpool John Moores University, Brownlow Hill, Liverpool L3 5RF, UK
2
Department of Physics, Lancaster University, Bailrigg Campus, Lancaster LA1 4YW, UK
3
Tuorla Observatory, Department of Physics and Astronomy, University of Turku, Väisäläntie 20, 21500 Piikkiö, Finland
4
Finnish Center for Astrophysics with ESO, University of Turku, Väisäläntie 20, 21500 Piikkiö, Finland
5
Department of Physics, Bath University, Bath BA2 7AY, UK
6
Centro Brasileiro de Pesquisas Fisicas, Rua Dr. Xavier Sigaud 150, Rio de Janeiro, RJ 22290-180, Brazil
*
Author to whom correspondence should be addressed.
Academic Editors: Jose L. Gómez, Alan P. Marscher and Svetlana G. Jorstad
Received: 15 July 2016 / Revised: 19 September 2016 / Accepted: 23 September 2016 / Published: 26 October 2016
(This article belongs to the Special Issue Blazars through Sharp Multi-wavelength Eyes)
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Abstract

We present polarimetric and photometric observations from a sample of 15 γ-ray bright blazars with data from the Tuorla blazar monitoring program (KVA DIPOL) and Liverpool Telescope (LT) Ringo2 polarimeters (supplemented with γ-ray data from Fermi-LAT). We find that (1) The optical magnitude and γ-ray flux are positively correlated; (2) electric vector position angle rotations can occur in any blazar subclass; (3) there is no difference in the γ-ray flaring rates in the sample between subclasses; flares can occur during and outside of rotations with no preference for this behaviour; (4) the average degree of polarisation (P), optical magnitude and γ-ray flux are lower during a rotation compared with during non-rotation; (5) the number of observed flaring events and optical polarisation rotations are correlated and (6) the maximum observed P increases from ∼10% to ∼30% to ∼40% for subclasses with synchrotron peaks at high, intermediate and low frequencies respectively. View Full-Text
Keywords: galaxies; active; blazars; polarisation galaxies; active; blazars; polarisation
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Jermak, H.; Steele, I.; Lindfors, E.; Hovatta, T.; Nilsson, K.; Lamb, G.; Mundell, C.; Barres De Almeida, U.; Berdyugin, A.; Kadenius, V.; Reinthal, R.; Takalo, L. Ringo2 Optical Polarimetry of Blazars. Galaxies 2016, 4, 52.

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