A1 Refereed original research article in a scientific journal
Lost in the curve: Investigating the disappearing knots in blazar 3C 454.3
Authors: Traianou, Efthalia; Krichbaum, Thomas P.; Gómez, José L.; Lico, Rocco; Paraschos, Georgios Filippos; Cho, Ilje; Ros, Eduardo; Zhao, Guang-Yao; Liodakis, Ioannis; Dahale, Rohan; Toscano, Teresa; Fuentes, Antonio; Foschi, Marianna; Casadio, Carolina; MacDonald, Nicholas; Kim, Jae-Young; Hervet, Olivier; Jorstad, Svetlana; Lobanov, Andrei P.; Hodgson, Jeffrey; Myserlis, Ioannis; Agudo, Ivan; Zensus, Anton J.; Marscher, Alan P.
Publisher: EDP Sciences
Publication year: 2024
Journal: Astronomy and Astrophysics
Journal name in source: ASTRONOMY & ASTROPHYSICS
Article number: A154
Volume: 682
ISSN: 0004-6361
eISSN: 1432-0746
DOI: https://doi.org/10.1051/0004-6361/202347267
Publication's open availability at the time of reporting: Open Access
Publication channel's open availability : Open Access publication channel
Web address : https://www.aanda.org/articles/aa/full_html/2024/02/aa47267-23/aa47267-23.html
Self-archived copy’s web address: https://research.utu.fi/converis/portal/detail/Publication/387244529
Preprint address: https://arxiv.org/abs/2312.15556
Self-archived copy's licence: CC BY
Self-archived copy's version: Publisher`s PDF
One of the most well-known extragalactic sources in the sky, quasar 3C 454.3, shows a curved parsec-scale jet that has been exhaustively monitored with very-long-baseline interferometry (VLBI) over the recent years. In this work, we present a comprehensive analysis of four years of high-frequency VLBI observations at 43 GHz and 86 GHz, between 2013-2017, in total intensity and linear polarization. The images obtained from these observations enabled us to study the jet structure and the magnetic field topology of the source on spatial scales down to 4.6 parsec in projected distance. The kinematic analysis reveals the abrupt vanishing of at least four new superluminal jet features in a characteristic jet region (i.e., region C), which is located at an approximate distance of 0.6 milliarcsec from the VLBI core. Our results support a model in which the jet bends, directing the relativistic plasma flow almost perfectly toward our line of sight, co-spatially with the region where components appear to stop.
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