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Multifrequency Photo-polarimetric WEBT Observation Campaign on the Blazar S5 0716+714: Source Microvariability and Search for Characteristic Timescales | | G. Bhatta
; Ł. Stawarz
; M. Ostrowski
; A. Markowitz
; H. Akitaya
; A. A. Arkharov
; R. Bachev
; E. Benítez
; G. A. Borman
; D. Carosati
; A. D. Cason
; R. Chanishvili
; G. Damljanovic
; S. Dhalla
; A. Frasca
; D. Hiriart
; S-M. Hu
; R. Itoh
; D. Jableka
; S. Jorstad
; M. D. Jovanovic
; K. S. Kawabata
; S. A. Klimanov
; O. Kurtanidze
; V. M. Larionov
; D. Laurence
; G. Leto
; A. P. Marscher
; J. W. Moody
; Y. Moritani
; J. M. Ohlert
; A. Di Paola
; C. M. Raiteri
; N. Rizzi
; A. C. Sadun
; M. Sasada
; S. Sergeev
; A. Strigachev
; K. Takaki
; I. S. Troitsky
; T. Ui
; M. Villata
; O. Vince
; J. R. Webb
; M. Yoshida
; S. Zola
; | | Date: |
11 Aug 2016 | | Abstract: | Here we report on the results of the WEBT photo-polarimetric campaign
targeting the blazar S5~0716+71, organized in March 2014 to monitor the source
simultaneously in BVRI and near IR filters. The campaign resulted in an
unprecedented dataset spanning $sim 110$,h of nearly continuous, multi-band
observations, including two sets of densely sampled polarimetric data mainly in
R filter. During the campaign, the source displayed pronounced variability with
peak-to-peak variations of about $30\%$ and "bluer-when-brighter" spectral
evolution, consisting of a day-timescale modulation with superimposed hourlong
microflares characterized by $sim 0.1$,mag flux changes. We performed an
in-depth search for quasi-periodicities in the source light curve; hints for
the presence of oscillations on timescales of $sim 3$,h and $sim 5$,h do
not represent highly significant departures from a pure red-noise power
spectrum. We observed that, at a certain configuration of the optical
polarization angle relative to the positional angle of the innermost radio jet
in the source, changes in the polarization degree led the total flux
variability by about 2,h; meanwhile, when the relative configuration of the
polarization and jet angles altered, no such lag could be noted. The
microflaring events, when analyzed as separate pulse emission components, were
found to be characterized by a very high polarization degree ($> 30\%$) and
polarization angles which differed substantially from the polarization angle of
the underlying background component, or from the radio jet positional angle. We
discuss the results in the general context of blazar emission and energy
dissipation models. | | Source: | arXiv, 1608.3531 | | Services: | Forum | Review | PDF | Favorites | |
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