The outburst of the Blazar S4 0954+658 in 2011 March–April
The outburst of the Blazar S4 0954+658 in 2011 March–April
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.
Morozova, D. A.
b263c20a-f8b0-4c5d-9fcd-22397170e3ae
Mchardy, Ian
4f215137-9cc4-4a08-982e-772a0b24c17e
22 July 2014
Morozova, D. A.
b263c20a-f8b0-4c5d-9fcd-22397170e3ae
Mchardy, Ian
4f215137-9cc4-4a08-982e-772a0b24c17e
Morozova, D. A.
,
et al.
(2014)
The outburst of the Blazar S4 0954+658 in 2011 March–April.
The Astronomical Journal, 148 (3), [42].
(doi:10.1088/0004-6256/148/3/42).
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 ± 0.3c. 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.
Text
THE OUTBURST OF THE BLAZAR S4 0954+658 IN 2011 MARCH–APRIL
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Accepted/In Press date: 29 May 2014
Published date: 22 July 2014
Organisations:
Astronomy Group
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Local EPrints ID: 411755
URI: http://eprints.soton.ac.uk/id/eprint/411755
ISSN: 1538-3881
PURE UUID: 8a31cf27-82e3-45bc-9741-212751a453b1
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Date deposited: 23 Jun 2017 16:31
Last modified: 15 Mar 2024 14:46
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Author:
D. A. Morozova
Author:
Ian Mchardy
Corporate Author: et al.
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