Abstract.
We perform monthly monitoring of the quasar 1633+382 (4C+38.41) within a sample of γ-ray blazars with the VLBA at 43 GHz along with optical photometric and polarimetric observations. We construct the γ-ray light curve of 1633+382 using data obtained by the Fermi LAT. We find that a high γ-ray state of the quasar starting in 2009 September is simultaneous with an increase of the flux in the mm-wave VLBI core. We resolve a superluminal feature on the VLBA images that appears to be responsible for the mm-wave flux increase. We find a strong correlation between optical and γ-ray light curves with a delay of γ-ray variations of 5±3 days, as well as a strong correlation between optical flux and degree of polarization during the high γ-ray state. Comparison between the optical polarization position angle and that in the VLBI core supports the idea that in the quasar 1633+382 a high γ-ray state is connected with processes originating near the mm-VLBI core.
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References
Abdo, A. A. et al. 2010, Astrophys. J., 715, 429.
Chatterjee R. et al. 2008, Astrophys. J., 689, 79.
Edelson, R. A., Krolik, J. H 1988, Astrophys. J., 333, 646.
Jorstad, S. G. et al. 2010, Astrophys. J., 715, 362.
Marscher, A. P. et al. 2010, Astrophys. J., 710, L126.
Poutanen, Y., Stern, B. 2010, Astrophys. J., 717, L118.
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Jorstad, S.G., Marscher, A.P., Agudo, I. et al. Multi-Frequency Observations of Gamma-Ray Blazar 1633+382. J Astrophys Astron 32, 239 (2011). https://doi.org/10.1007/s12036-011-9038-z
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DOI: https://doi.org/10.1007/s12036-011-9038-z