Multi-frequency VLBA study of the blazar S5 0716+714 during the active state in 2004

Rastorgueva, E. A.; Wiik, K.; Bajkova, A. T.; Valtaoja, E.; Takalo, L. O.; Vetukhnovskaya, Yu. N.; Mahmud, M.

doi:10.1051/0004-6361/201015241

Cited by 20 publications

(20 citation statements)

References 27 publications

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“…Knots K1 and K3 move to the northeast along slightly different trajectories with apparent speeds of 18.1 ± 0.5 c and 21 ± 2 c, respectively. An apparent speed of ∼20 c seems to be common in the parsec scale jet of S5 0716+71 (see, e.g., Rastorgueva et al 2011). Knot K1 undergoes both an acceleration along the jet μ = 0.23 ± 0.06 mas yr −2 and perpendicular to the jet μ ⊥ = −0.19 ± 0.06 mas yr −2 .…”

Section: Radio Observationsmentioning

confidence: 99%

The Outburst of the Blazar S5 0716+71 in 2011 October: Shock in a Helical Jet

Ларионов

Jorstad

Marscher

et al. 2013

ApJ

143

155

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We present the results of optical (R band) photometric and polarimetric monitoring and Very Long Baseline Array (VLBA) imaging of the blazar S5 0716+714 along with Fermi γ -ray data during a multi-waveband outburst in 2011 October. We analyze total and polarized intensity images of the blazar obtained with the VLBA at 43 GHz during and after the outburst. Monotonic rotation of the linear polarization vector at a rate of 50 • per night coincided with a sharp maximum in γ -ray and optical flux. At the same time, within the uncertainties, a new superluminal knot appeared with an apparent speed of 21 ± 2c. The general multi-frequency behavior of the outburst can be explained within the framework of a shock wave propagating along a helical path in the blazar's jet.

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Section: Radio Observationsmentioning

confidence: 99%

The Outburst of the Blazar S5 0716+71 in 2011 October: Shock in a Helical Jet

Ларионов

Jorstad

Marscher

et al. 2013

ApJ

143

155

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“…Britzen et al (2009) suggest that there is an apparent stationarity of jet components relative to the core. However, recently apparent speeds of ∼40 c have been reported in Rastorgueva et al (2011), Larionov et al (2013), Lister et al (2013) and Rani et al (2015). Britzen et al (2009), Rastorgueva et al (2011) and Rani et al (2014) observed nonradial motion and wiggling component trajectories in the inner milliarcsecond jet region.…”

Section: Introductionmentioning

confidence: 97%

“…Owing to its remarkable variability, S5 0716+714 has been the subject of many optical monitoring campaigns (Wagner et al 1996;Montagni et al 2006;Rani et al 2011Rani et al , 2013Rani et al , 2015. Several authors carried out flux variability studies (e.g., Quirrenbach et al 1991;Wagner et al 1996) and morphological/kinematic studies at radio frequencies (Antonucci et al 1986;Witzel et al 1988;Jorstad et al 2001;Bach et al 2005;Rastorgueva et al 2011). The observed intraday variability at radio wavelengths is likely to be a mixture of intrinsic and external (due to interstellar scintillation) mechanisms.…”

Section: Introductionmentioning

confidence: 99%

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

Ahnen¹,

Ansoldi²,

Antonelli³

et al. 2018

A&A

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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. This scenario is also consistent with the SED modeling.

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“…Britzen et al (2009) suggest that there is an apparent stationarity of jet components relative to the core; more recent studies, however, have reported motion as fast as ∼40 c (Rastorgueva et al 2011;Larionov et al 2013;Lister et al 2013). Non-radial motion and wiggling component trajectories have often been observed in the inner mas jet region of the source (Britzen et al 2009;Rastorgueva et al 2011;Rani et al 2014).…”

Section: Introductionmentioning

confidence: 99%

Connection between inner jet kinematics and broadband flux variability in the BL Lacertae object S5 0716+714

Rani¹,

Krichbaum²,

Marscher³

et al. 2015

A&A

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We present a high-frequency very long baseline interferometry (VLBI) kinematical study of the BL Lac object S5 0716+714 over the time period of September 2008 to October 2010. The aim of the study is to investigate the relation of the jet kinematics to the observed broadband flux variability. We find significant non-radial motions in the jet outflow of the source. In the radial direction, the highest measured apparent speed is ∼37 c, which is exceptionally high, especially for a BL Lac object. Patterns in the jet flow reveal a roughly stationary feature ∼0.15 mas downstream of the core. The long-term fits to the component trajectories reveal acceleration in the submas region of the jet. The measured brightness temperature, T B , follows a continuous trend of decline with distance, T B ∝ r −(2.36±0.41) jet , which suggests that there is a gradient in Doppler factor along the jet axis. Our analysis favors that a moving disturbance (or a shock wave) from the base of the jet produces the high-energy (optical to γ-ray) variations upstream of the 7 mm core and then later causes an outburst in the core. Repetitive optical/γ-ray flares and the curved trajectories of the associated components suggest that the shock front propagates along a bent trajectory or helical path. Sharper γ-ray flares could be related to the passage of moving disturbances through the stationary feature. Our analysis indicates that the γ-ray and radio emission regions have different Doppler factors.

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Multi-frequency VLBA study of the blazar S5 0716+714 during the active state in 2004

Cited by 20 publications

References 27 publications

The Outburst of the Blazar S5 0716+71 in 2011 October: Shock in a Helical Jet

The Outburst of the Blazar S5 0716+71 in 2011 October: Shock in a Helical Jet

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

Connection between inner jet kinematics and broadband flux variability in the BL Lacertae object S5 0716+714

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