PoS - Proceedings of Science
Volume 312 - 7th International Fermi Symposium (IFS2017) - Session Active Galactic Nuclei
High-resolution polarization imaging of the Fermi blazar 3C 279
B. Rani*  on behalf of the Fermi-LAT Collaboration, S. Jorstad and A.P. Marscher
Full text: pdf
Pre-published on: December 12, 2017
Published on: November 11, 2020
Abstract
Ever since the discovery by the Fermi mission that active galactic nuclei (AGN) produce copious amounts of high-energy emission, its origin has remained elusive. Using high-frequency radio interferometry (VLBI) polarization imaging, we could probe the magnetic field topology of the compact high-energy emission regions in blazars. A case study for the blazar 3C 279 reveals the presence of multiple γ-ray emission regions. Pass 8 Fermi-Large Area Telescope (LAT) data are used to investigate the flux variations in the GeV regime; six γ-ray flares were observed in the source during November 2013 to August 2014. We use the 43 GHz VLBI data to study the morphological changes in the jet. Ejection of a new component (NC2) during the first three γ-ray flares suggests the VLBI core as the possible site of the high-energy emission. A delay between the last three flares and the ejection of a new component (NC3) indicates that high- energy emission in this case is located upstream of the 43 GHz core (closer to the black hole).
DOI: https://doi.org/10.22323/1.312.0020
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