DOI:
10.1038/s41550-023-02105-7
IAA authors:
Fuentes, Antonio;Gómez, José L.;Zhao, Guang-Yao;Lico, Rocco;Cho, Ilje;Traianou, Efthalia;Toscano, Teresa;Dahale, Rohan;Foschi, Marianna
Authors:
Fuentes, Antonio;Gómez, José L.;Martí, José M.;Perucho, Manel;Zhao, Guang-Yao;Lico, Rocco;Lobanov, Andrei P.;Bruni, Gabriele;Kovalev, Yuri Y.;Chael, Andrew;Akiyama, Kazunori;Bouman, Katherine L.;Sun, He;Cho, Ilje;Traianou, Efthalia;Toscano, Teresa;Dahale, Rohan;Foschi, Marianna;Gurvits, Leonid I.;Jorstad, Svetlana;Kim, Jae-Young;Marscher, Alan P.;Mizuno, Yosuke;Ros, Eduardo;Savolainen, Tuomas
Abstract:
Supermassive black holes at the centre of active galactic nuclei power some of the most luminous objects in the Universe. Typically, very-long-baseline interferometric observations of blazars have revealed only funnel-like morphologies with little information on the internal structure of the ejected plasma or have lacked the dynamic range to reconstruct the extended jet emission. Here we present microarcsecond-scale angular resolution images of the blazar 3C 279 obtained at 22 GHz with the space very-long-baseline interferometry mission RadioAstron, which allowed us to resolve the jet transversely and reveal several filaments produced by plasma instabilities in a kinetically dominated flow. The polarimetric properties derived from our high-angular-resolution and broad-dynamic-range images are consistent with the presence of a helical magnetic field threaded to the jet. We infer a clockwise rotation as seen in the direction of flow motion with an intrinsic helix pitch angle of ~45° and a Lorentz factor of ~13 at the time of observation. We also propose a model to explain blazar jet radio variability in which emission features travelling down the jet may manifest as a result of differential Doppler boosting within the filaments, as opposed to the standard shock-in-jet model. Characterizing such variability is particularly important given the relevance of blazar physics from cosmic particle acceleration to standard candles in cosmology.
URL:
https://ui.adsabs.harvard.edu/#abs/2023NatAs...7.1359F/abstract
Keywords:
Astrophysics - High Energy Astrophysical Phenomena;Astrophysics - Astrophysics of Galaxies