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Title: Radio to gamma-ray variability study of blazar S5 0716+714

Journal Article · · Astronomy and Astrophysics

In this paper, we present the results of a series of radio, optical, X-ray, and γ-ray observations of the BL Lac object S50716+714 carried out between April 2007 and January 2011. The multifrequency observations were obtained using several ground- and space-based facilities. The intense optical monitoring of the source reveals faster repetitive variations superimposed on a long-term variability trend on a time scale of ~350 days. Episodes of fast variability recur on time scales of ~60-70 days. The intense and simultaneous activity at optical and γ-ray frequencies favors the synchrotron self-Compton mechanism for the production of the high-energy emission. Two major low-peaking radio flares were observed during this high optical/γ-ray activity period. The radio flares are characterized by a rising and a decaying stage and agrees with the formation of a shock and its evolution. We found that the evolution of the radio flares requires a geometrical variation in addition to intrinsic variations of the source. Different estimates yield robust and self-consistent lower limits of δ ≥ 20 and equipartition magnetic field Beq ≥ 0.36 G. Causality arguments constrain the size of emission region θ ≤ 0.004 mas. We found a significant correlation between flux variations at radio frequencies with those at optical and γ-rays. Theoptical/GeV flux variations lead the radio variability by ~65 days. The longer time delays between low-peaking radio outbursts and optical flares imply that optical flares are the precursors of radio ones. An orphan X-ray flare challenges the simple, one-zone emission models, rendering them too simple. Finally, here we also describe the spectral energy distribution modeling of the source from simultaneous data taken through different activity periods.

Research Organization:
SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)
Sponsoring Organization:
USDOE
Contributing Organization:
Fermi-LAT Collaboration
Grant/Contract Number:
AC02-76SF00515
OSTI ID:
1356594
Journal Information:
Astronomy and Astrophysics, Vol. 552; ISSN 0004-6361
Publisher:
EDP SciencesCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 75 works
Citation information provided by
Web of Science

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Cited By (35)

Mid-infrared variability of blazars: a view from NEOWISE survey journal July 2018
Radio variability of the blazar S5 0716+714: a ∼6.1 year quasi-periodicity journal July 2018
Why are some BL Lacertaes detected by Fermi , but others not? journal February 2014
Radio jet emission from GeV-emitting narrow-line Seyfert 1 galaxies journal February 2015
Location of γ -ray emission and magnetic field strengths in OJ 287 journal January 2017
The TANAMI Multiwavelength Program: Dynamic spectral energy distributions of southern blazars journal June 2016
Simultaneous dual-frequency radio observations of S5 0716+714: A search for intraday variability with the Korean VLBI Network journal April 2017
Multi-wavelength characterization of the blazar S5 0716+714 during an unprecedented outburst phase journal November 2018
Mojave. x. Parsec-Scale jet Orientation Variations and Superluminal Motion in Active Galactic Nuclei journal October 2013
MULTIWAVELENGTH VARIABILITY PROPERTIES OF FERMI BLAZAR S5 0716+714 journal February 2014
The Connection Between the Radio jet and the Gamma-Ray Emission in the Radio Galaxy 3c 120 journal July 2015
Long-Term Multi-Band Photometric Monitoring of Blazar s5 0716+714 journal June 2015
Intra-day optical multi-band quasi-simultaneous observation of BL Lacertae object S5 0716+714 from 2013 to 2016 journal June 2018
Multiwavelength photometric and spectropolarimetric analysis of the FSRQ 3C 279 journal June 2018
Multiwavelength cross-correlations and flaring activity in bright blazars journal August 2018
Multiwavelength Picture of the Blazar S5 0716+714 during Its Brightest Outburst journal November 2016
H.E.S.S. Monitoring of PKS 2155-304 in 2015 and 2016 journal January 2019
Multicolor Optical Monitoring of the BL Lacertae Object S5 0716+714 during the 2012 Outburst journal July 2017
Interferometric Monitoring of Gamma-Ray Bright AGNs: S5 0716+714 journal May 2017
Exploring the Variability of the Flat Spectrum Radio Source 1633+382. I. Phenomenology of the Light Curves journal January 2018
Exploring the Variability of the Flat-spectrum Radio Source 1633+382. II. Physical Properties journal June 2018
Ejection of Double Knots from the Radio Core of PKS 1510–089 during the Strong Gamma-Ray Flares in 2015 journal May 2019
Probing Blazar Emission Processes with Optical/Gamma-Ray Flare Correlations journal July 2019
Optical Variability Modeling of Newly Identified Blazar Candidates behind Magellanic Clouds journal January 2020
Multiwavelength picture of the blazar S5 0716+714 during its brightest outburst text January 2016
Multi-wavelength characterization of the blazar S5 0716+714 during an unprecedented outburst phase text January 2018
Multiwavelength Picture of the Blazar S5 0716+714 during Its Brightest Outburst text January 2016
Location of Gamma-ray emission and magnetic field strengths in OJ 287 text January 2016
Multiwavelength picture of the blazar S5 0716+714 during its brightest outburst text January 2017
Interferometric Monitoring of Gamma-ray Bright AGNs: S5 0716+714 text January 2017
Multiwavelength Photometric and Spectropolarimetric Analysis of the FSRQ 3C 279 text January 2018
Multiwavelength Cross-Correlations and Flaring Activity in Bright Blazars text January 2018
Ejection of Double knots from the radio core of PKS 1510--089 during the strong gamma-ray flares in 2015 text January 2019
Optical variability modeling of newly identified blazar candidates behind Magellanic Clouds text January 2019
H.E.S.S. Monitoring of PKS 2155-304 in 2015 and 2016 text January 2019