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THE OUTBURST OF THE BLAZAR S5 0716+71 IN 2011 OCTOBER: SHOCK IN A HELICAL JET

V. M. LarionovAstronomical Institute of St. Petersburg State University, Universitetsky Pr. 28, Petrodvorets 198504, St. Petersburg, Russia; [email protected]S. G. JorstadAstronomical Institute of St. Petersburg State University, Universitetsky Pr. 28, Petrodvorets 198504, St. Petersburg, Russia; [email protected]A. P. MarscherInstitute for Astrophysical Research, Boston University, 725 Commonwealth Ave., Boston, MA 02215-1401, USA; [email protected]D. A. MorozovaAstronomical Institute of St. Petersburg State University, Universitetsky Pr. 28, Petrodvorets 198504, St. Petersburg, Russia; [email protected]D. A. BlinovAstronomical Institute of St. Petersburg State University, Universitetsky Pr. 28, Petrodvorets 198504, St. Petersburg, Russia; [email protected]V. A. Hagen-ThornAstronomical Institute of St. Petersburg State University, Universitetsky Pr. 28, Petrodvorets 198504, St. Petersburg, Russia; [email protected]T. S. KonstantinovaAstronomical Institute of St. Petersburg State University, Universitetsky Pr. 28, Petrodvorets 198504, St. Petersburg, Russia; [email protected]E. N. KopatskayaAstronomical Institute of St. Petersburg State University, Universitetsky Pr. 28, Petrodvorets 198504, St. Petersburg, Russia; [email protected]L. V. LarionovaAstronomical Institute of St. Petersburg State University, Universitetsky Pr. 28, Petrodvorets 198504, St. Petersburg, Russia; [email protected]E. G. LarionovaAstronomical Institute of St. Petersburg State University, Universitetsky Pr. 28, Petrodvorets 198504, St. Petersburg, Russia; [email protected]I. S. TroitskyAstronomical Institute of St. Petersburg State University, Universitetsky Pr. 28, Petrodvorets 198504, St. Petersburg, Russia; [email protected]

2013en

ABI

Аннотация

We present the results of optical (R band) photometric and polarimetric monitoring and Very Long Baseline Array (VLBA) imaging of the blazar S5 0716+714 along with Fermi gamma-ray data during a multi-waveband outburst in 2011 October. We analyze total and polarized intensity images of the blazar obtained with the VLBA at 43 GHz during and after the outburst. Monotonic rotation of the linear polarization vector at a rate of >50 degrees per night coincided with a sharp maximum in gamma-ray and optical flux. At the same time, within the uncertainties, a new superluminal knot appeared, with an apparent speed of ~21c. The general multi-frequency behavior of the outburst can be explained within the framework of a shock wave propagating along a helical path in the blazar's jet.

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DOI: 10.1088/0004-637x/768/1/40

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