The Outburst of the Blazar S4 0954+658 in 2011 March-April
D. A. Morozova,Valeri M. Larionov,Valeri M. Larionov,Valeri M. Larionov,Ivan S. Troitsky,Svetlana G. Jorstad,Svetlana G. Jorstad,Alan P. Marscher,José L. Gómez,Dmitry A. Blinov,Dmitry A. Blinov,N. V. Efimova,N. V. Efimova,Vladimir A. Hagen-Thorn,Vladimir A. Hagen-Thorn,E. I. Hagen-Thorn,E. I. Hagen-Thorn,Manasvita Joshi,Tatiana S. Konstantinova,E. N. Kopatskaya,L. V. Larionova,Elena G. Larionova,Anne Lähteenmäki,Joni Tammi,E. Rastorgueva-Foi,I. M. McHardy,Merja Tornikoski,I. Agudo,I. Agudo,I. Agudo,Carolina Casadio,Sol N. Molina,A. E. Volvach,L. N. Volvach +33 more
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In this article, the results of optical (R-band) photometric and polarimetric monitoring and Very Long Baseline Array imaging of the blazar S4,0954+658, along with Fermi γ-ray data during a multi-waveband outburst in 2011 March-April were presented.Abstract:
We present the results of optical ( R -band) photometric and polarimetric monitoring and Very Long Baseline Array imaging of the blazar S4 0954+658, along with Fermi γ-ray data during a multi-waveband outburst in 2011 March-April. After a faint state with a brightness level R ~ 17.6 mag registered in the first half of 2011 January, the optical brightness of the source started to rise and reached ~14.8 mag during the middle of March, showing flare-like behavior. The most spectacular case of intranight variability was observed during the night of 2011 March 9, when the blazar brightened by ~0.7 mag within 7 hr. During the rise of the flux, the position angle of the optical polarization rotated smoothly over more than 300°. At the same time, within 1σ uncertainty, a new superluminal knot appeared with an apparent speed of 19.0 ± 0.3 c . We have very strong evidence that this knot is associated with the multi-waveband outburst in 2011 March-April. We also analyze the multi-frequency behavior of S4 0954+658 during a number of minor outbursts from 2008 August to 2012 April. We find some evidence of connections between at least two additional superluminal ejecta and near-simultaneous optical flares.read more
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Journal ArticleDOI
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