Jet outflow and gamma-ray emission correlations in S5 0716+714

Abstract

Using millimeter-very long baseline interferometry (VLBI) observations of the BL Lac object S5 0716+714 from August 2008 to September 2013, we investigate variations in the core flux density and orientation of the sub-parsec scale jet i.e. position angle. The gamma-ray data obtained by the Fermi-LAT (Large Area Telescope) are used to investigate the high-energy flux variations over the same time period. For the first time in any blazar, we report a significant correlation between the gamma-ray flux variations and the position angle (PA) variations in the VLBI jet. The cross-correlation analysis also indicates a positive correlation such that the mm-VLBI core flux density variations are delayed with respect to the gamma-ray flux by 82$\pm$32 days. This suggests that the high-energy emission is coming from a region located $\ge$(3.8$\pm$1.9) parsecs upstream of the mm-VLBI core (closer to the central black hole). These results imply that the observed inner jet morphology has a strong connection with the observed gamma-ray flares.

5 pages, 6 figures, accepted for publication in A&A Letters

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• Multifrequency monitoring of the blazar 0716+714 during the GASP-WEBT-AGILE campaign of 2007
• Testing the inverse-Compton catastrophe scenario in the intra-day variable blazar S5 0716+71, III. Rapid and correlated flux density variability from radio to sub-mm bands
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• Radio$-\gamma -$ray response in blazars as a signature of adiabatic blob expansion
• A multiband study and exploration of the radio wave - $\gamma$-ray connection in 3C 84
• Multi-wavelength observations of the gamma-ray flaring quasar S4 1030+61 in 2009-2014
• Probing the gamma-ray variability in 3C279 using broadband observations
• Enabling Transformational ngEHT Science via the Inclusion of 86 GHz Capabilities
• Multi-color optical monitoring of the BL Lacertae object S5 0716+714 during the 2012 outburst
• A 31.3 day Transient Quasiperiodic Oscillation in Gamma-ray Emission from Blazar S5 0716+714
• Localizing the $\gamma$-ray emitting region in the blazar TXS 2013+370
• Interferometric Monitoring of Gamma-ray Bright AGNs: S5 0716+714
• Long-term multiband optical variability of S5 0716+714 blazar
• Hard X-ray emission in Centaurus A
• Jet Archaeology and Forecasting: Image Variability and Magnetic Field Configuration