Volume 571, November 2014
|Number of page(s)||5|
|Published online||06 November 2014|
Jet outflow and gamma-ray emission correlations in S5 0716+714⋆
Max-Planck-Institut für Radioastronomie (MPIfR),
Auf dem Hügel 69,
2 Institute for Astrophysical Research, Boston University, 725 Commonwealth Avenue, Boston, MA 02215, USA
Received: 12 August 2014
Accepted: 30 September 2014
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 γ-ray data obtained by the Fermi 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 γ-ray flux variations and the position angle 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 γ-ray flux by 82±32 days. This suggests that the high-energy emission is coming from a region located ≥(3.8±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 γ-ray flares.
Key words: galaxies: active / BL Lacertae objects: individual: S5 0716+714 / galaxies: jets / gamma rays: galaxies / radio continuum: galaxies
Appendix A is available in electronic form at http://www.aanda.org
© ESO, 2014
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