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The outburst of the blazar S4 0954+658 in 2011 March-April


Morozova, DA and Larionov, VM and Troitsky, IS and Jorstad, SG and Marscher, AP and Gomez, JL and Blinov, DA and Efimova, NV and Hagen-Thorn, VA and Hagen-Thorn, EI and Joshi, M and Konstantinova, TS and Kopatskaya, EN and Larionova, LV and Larionova, EG and Lahteenmaki, A and Tammi, J and Rastorgueva-Foi, E and McHardy, I and Tornikoski, M and Agudo, I and Casadio, C and Molina, SN and Volvach, AE and Volvach, LN, The outburst of the blazar S4 0954+658 in 2011 March-April, The Astrophysical Journal, 148, (3) Article 42. ISSN 0004-637X (2014) [Refereed Article]

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Copyright Statement

Copyright 2014 The American Astronomical Society

DOI: doi:10.1088/0004-6256/148/3/42


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 ± 0.3c. 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.

Item Details

Item Type:Refereed Article
Keywords:BL Lacertae objects: individual: S4 0954+658, galaxies: active, galaxies: jets, polarization
Research Division:Physical Sciences
Research Group:Astronomical sciences
Research Field:Cosmology and extragalactic astronomy
Objective Division:Expanding Knowledge
Objective Group:Expanding knowledge
Objective Field:Expanding knowledge in the physical sciences
UTAS Author:Rastorgueva-Foi, E (Dr Elizaveta Rastorgueva-Foi)
ID Code:98391
Year Published:2014
Web of Science® Times Cited:25
Deposited By:Mathematics and Physics
Deposited On:2015-02-13
Last Modified:2015-05-19

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