Synchronous activity across the bands supports the idea that the emission regions responsible for the gamma-ray and optical flares are co-spatial and located in the vicinity of the mm-wave core of the parsec-scale jet. We find a correlation between the gamma rays, optical R band, and 43 GHz variability on a long-term scale (months and years), and a good general alignment between EVPAs in R band and at 43 GHz, while the correlation between short-term variations (days and weeks) is weaker. ![]() ![]() The rapid variability of the optical linear polarization may be explained by a strong turbulence in the jet plasma. During the observations, the source showed several dramatic flares at gamma rays and optical bands, with the rising branch of a gamma-ray flare accompanied by a rapid rotation of the polarization position angle (EVPA), a fast increase of the degree of polarization in the optical band, brightening of the VLBI core, and appearance of a new superluminal component in the parsec-scale jet. ![]() We analyze the broadband activity of the flat spectrum radio quasar PKS 1222+216 from 2008 to 2015 using multi-frequency monitoring which involves gamma-ray data from the Fermi Large Area Telescope, total intensity and linear polarization observations from different optical telescopes in R band, and imaging of the inner jet structure with the Very Long Baseline Array (VLBA) at 43 GHz.
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