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Multi-wavelength characterization of the blazar S5 0716+714 during an unprecedented outburst phase

Journal Article · · Astronomy and Astrophysics
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Context. The BL Lac object S5 0716+714, a highly variable blazar, underwent an impressive outburst in January 2015 (Phase A), followed by minor activity in February (Phase B). The MAGIC observations were triggered by the optical flux observed in Phase A, corresponding to the brightest ever reported state of the source in the R-band. Aims.The comprehensive dataset collected is investigated in order to shed light on the mechanism of the broadband emission. Methods. Multi-wavelength light curves have been studied together with the broadband spectral energy distributions (SEDs). The sample includes data from Effelsberg, OVRO, Metsähovi, VLBI, CARMA, IRAM, SMA, Swift-UVOT, KVA, Tuorla, Steward, RINGO3, KANATA, AZT-8+ST7, Perkins, LX-200, Swift-XRT, NuSTAR, Fermi-LAT and MAGIC. Results. The flaring state of Phase A was detected in all the energy bands, providing for the first time a multi-wavelength sample of simultaneous data from the radio band to the very-high-energy (VHE, E > 100 GeV). In the constructed SED, the Swift-XRT+NuSTAR data constrain the transition between the synchrotron and inverse Compton components very accurately, while the second peak is constrained from 0.1 GeV to 600 GeV by Fermi+MAGIC data. The broadband SED cannot be described with a one-zone synchrotron self-Compton model as it severely underestimates the optical flux in order to reproduce the X-ray to γ-ray data. Instead we use a two-zone model. The electric vector position angle (EVPA) shows an unprecedented fast rotation. An estimation of the redshift of the source by combined high-energy (HE, 0.1 GeV < E < 100 GeV) and VHE data provides a value of z = 0.31 ± 0.02stats ± 0.05sys, confirming the literature value. Conclusions. The data show the VHE emission originating in the entrance and exit of a superluminal knot in and out of a recollimation shock in the inner jet. A shock–shock interaction in the jet seems responsible for the observed flares and EVPA swing. Finally, this scenario is also consistent with the SED modeling.
Research Organization:
SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)
Sponsoring Organization:
USDOE
Contributing Organization:
Fermi-LAT Collaboration; MAGIC Collaboration; MWL Collaborators
Grant/Contract Number:
AC02-76SF00515
OSTI ID:
1490365
Journal Information:
Astronomy and Astrophysics, Journal Name: Astronomy and Astrophysics Vol. 619; ISSN 0004-6361
Publisher:
EDP SciencesCopyright Statement
Country of Publication:
United States
Language:
English

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Radio to gamma-ray variability study of blazar S5 0716+714 text January 2013
The Outburst of the Blazar S5 0716+71 in 2011 October: Shock in a Helical Jet text January 2013
Leptonic and Hadronic Modeling of Fermi-Detected Blazars text January 2013
Detection of significant cm to sub-mm band radio and gamma-ray correlated variability in Fermi bright blazars text January 2014
Multi-wavelength study of flaring activity in BL Lac object S5 0716+714 during 2015 outburst text January 2015
First hard X-ray observations of the blazar S5 0716+714 with NuSTAR during a multiwavelength campaign text January 2016
The RINGO2 and DIPOL Optical Polarisation Catalogue of Blazars text January 2016
Polarimetry and Photometry of Gamma-Ray Bursts with RINGO2 text January 2017
The BL Lac objects OQ 530 and S5 0716+714. Simultaneous observations in the X-rays, radio, optical and TeV bands text January 2003
Optical and radio behaviour of the BL Lacertae object 0716+714 text January 2003
On characterising the variability properties of X-ray light curves from active galaxies text January 2003
Polarization and structure of relativistic parsec-scale AGN jets text January 2004
Polarimetric Observations of 15 Active Galactic Nuclei at High Frequencies: Jet Kinematics from Bimonthly Monitoring with the Very Long Baseline Array text January 2005
The Leiden/Argentine/Bonn (LAB) Survey of Galactic HI: Final data release of the combined LDS and IAR surveys with improved stray-radiation corrections text January 2005
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Cited By (4)

Monitoring of the radio galaxy M 87 during a low-emission state from 2012 to 2015 with MAGIC journal January 2020
High-energy neutrino flux from individual blazar flares journal September 2019
High energy neutrino flux from individual blazar flares text January 2019
Monitoring of the radio galaxy M87 during a low emission state from 2012 to 2015 with MAGIC text January 2020


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