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18–22 cm VLBA Observational Evidence for Toroidal B-Field Components in Six AGN Jets

Instituto de Astronomia, Geofísica e Ciências Atmosféricas, Universidade de São Paulo, São Paulo 05508-090, Brasil
Physics Department, University College Cork, Cork, Ireland
Author to whom correspondence should be addressed.
Academic Editors: Jose L. Gómez, Alan P. Marscher and Svetlana G. Jorstad
Galaxies 2016, 4(3), 18;
Received: 5 July 2016 / Revised: 20 August 2016 / Accepted: 26 August 2016 / Published: 30 August 2016
(This article belongs to the Special Issue Blazars through Sharp Multi-wavelength Eyes)
PDF [575 KB, uploaded 30 August 2016]


The formation of relativistic jets in Active Galactic Nuclei (AGN) is related to accretion onto their central supermassive black holes, and magnetic (B) fields are believed to play a central role in launching, collimating, and accelerating the jet streams from very compact regions out to kiloparsec scales. We present results of Faraday rotation studies based on Very Long Baseline Array (VLBA) data obtained at 18–22 cm for six well known AGN (OJ 287, 3C 279, PKS 1510-089, 3C 345, BL Lac, and 3C 454.3), which probe projected distances out to tens of parsecs from the observed cores. We have identified statistically significant, monotonic, transverse Faraday rotation gradients across the jets of all but one of these sources, indicating the presence of toroidal B fields, which may be one component of helical B fields associated with these AGN jets. View Full-Text
Keywords: AGN; relativistic jets; polarization; radio interferometry AGN; relativistic jets; polarization; radio interferometry

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Motter, J.C.; Gabuzda, D.C. 18–22 cm VLBA Observational Evidence for Toroidal B-Field Components in Six AGN Jets. Galaxies 2016, 4, 18.

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