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Blinov, D; Pavlidou, V; Papadakis, I; Kiehlmann, S; Liodakis, I; Panopoulou, G. V; Angelakis, E; Baloković, M; Hovatta, T; King, O. G; Kus, A; Kylafis, N; Mahabal, A; Maharana, S; Myserlis, I; Paleologou, E; Papamastorakis, I; Pazderski, E; Pearson, T. J; Ramaprakash, A; Readhead, A. C. S; Reig, P; Tassis, K; Zensus, J. A
Monthly notices of the Royal Astronomical Society, 02/2018, Letnik: 474, Številka: 1Journal Article
Abstract We use results of our 3 yr polarimetric monitoring programme to investigate the previously suggested connection between rotations of the polarization plane in the optical emission of blazars and their gamma-ray flares in the GeV band. The homogeneous set of 40 rotation events in 24 sources detected by RoboPol is analysed together with the gamma-ray data provided by Fermi-LAT. We confirm that polarization plane rotations are indeed related to the closest gamma-ray flares in blazars and the time lags between these events are consistent with zero. Amplitudes of the rotations are anticorrelated with amplitudes of the gamma-ray flares. This is presumably caused by higher relativistic boosting (higher Doppler factors) in blazars that exhibit smaller amplitude polarization plane rotations. Moreover, the time-scales of rotations and flares are marginally correlated.
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