Galaxies
(Sep 2016)
Optical Outburst of the Blazar S4 0954+658 in Early 2015
Daria Morozova,
Valeri Larionov,
Svetlana Jorstad,
Alan Marscher,
Yulia Troitskaya,
Ivan Troitskiy,
Dmitriy Blinov,
Georg Borman,
Mark Gurwell
Affiliations
Daria Morozova
Department of Astrophysics, St. Petersburg State University, Universitetsky Prospekt, 28, Peterhof, St. Petersburg 198504, Russia
Valeri Larionov
Department of Astrophysics, St. Petersburg State University, Universitetsky Prospekt, 28, Peterhof, St. Petersburg 198504, Russia
Svetlana Jorstad
Department of Astrophysics, St. Petersburg State University, Universitetsky Prospekt, 28, Peterhof, St. Petersburg 198504, Russia
Alan Marscher
Institute for Astrophysical Research, Boston University, 725 Commonwealth Ave., Boston, MA 02215, USA
Yulia Troitskaya
Department of Astrophysics, St. Petersburg State University, Universitetsky Prospekt, 28, Peterhof, St. Petersburg 198504, Russia
Ivan Troitskiy
Department of Astrophysics, St. Petersburg State University, Universitetsky Prospekt, 28, Peterhof, St. Petersburg 198504, Russia
Dmitriy Blinov
Department of Astrophysics, St. Petersburg State University, Universitetsky Prospekt, 28, Peterhof, St. Petersburg 198504, Russia
Georg Borman
Crimean Astrophysical Observatory, P/O Nauchny, Crimea 298409, Russia
Mark Gurwell
Harvard-Smithsonian CfA, Cambridge, MA 02138, USA
DOI
https://doi.org/10.3390/galaxies4030024
Journal volume & issue
Vol. 4,
no. 3
Abstract
Read online
We analyze the behavior of the BL Lac object S4 0954+658 during an unprecedented bright optical flare in early 2015. The optical flare was accompanied by a powerful γ -ray flare and the detection of very-high-energy γ -ray emission. We analyze total and polarized intensity images obtained with the VLBA at 43 GHz and discover a new bright polarized superluminal knot, which was ejected from the VLBI-core during the peak of the flare.
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