Evidence for helical magnetic fields associated with AGN Jets and the action of a cosmic battery

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dc.contributor.author Gabuzda, Denise
dc.date.accessioned 2019-05-22T10:56:00Z
dc.date.available 2019-05-22T10:56:00Z
dc.date.issued 2018
dc.identifier.citation Gabuzda, D., 2019. Evidence for Helical Magnetic Fields Associated with AGN Jets and the Action of a Cosmic Battery. Galaxies, 7(1), 5 (14pp). DOI: 10.3390/galaxies7010005 en
dc.identifier.volume 7 en
dc.identifier.issued 1 en
dc.identifier.startpage 1 en
dc.identifier.endpage 14 en
dc.identifier.issn 2075-4434
dc.identifier.uri http://hdl.handle.net/10468/7963
dc.identifier.doi 10.3390/galaxies7010005 en
dc.description.abstract Theoretical models for the electromagnetic launching of astrophysical jets have long indicated that this process should generate helical magnetic fields, which should then propagate outward with the jet plasma. Polarization observations of jets are key for testing this idea, since they provide direct information about the magnetic field structures in the synchrotron-emitting radio jets. Together with Faraday rotation measurements, it is possible in some cases to reconstruct the three-dimensional magnetic-field structure. There is now plentiful evidence for the presence of helical magnetic fields associated with the jets of active galactic nuclei, most directly the detection of transverse Faraday-rotation gradients indicating a systematic change in the line-of-sight magnetic field component across the jets. A variety of models involving helical jet magnetic fields have also been used to explain a great diversity of phenomena, including not only the linear polarization and Faraday rotation structures, but also circular polarization, anomalous wavelength dependences of the linear polarization, variability of jet ridge lines, variability of the Faraday rotation sign and polarization angle rotations. A joint consideration of Faraday rotation measurements on parsec and kiloparsec scales indicates a magnetic-field and current structure similar to that of a co-axial cable, suggesting the action of some kind of battery mechanism, such as the Poynting–Robertson cosmic battery. en
dc.format.mimetype application/pdf en
dc.language.iso en en
dc.publisher MDPI en
dc.relation.uri https://www.mdpi.com/2075-4434/7/1/5
dc.rights © 2018 The Author. This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0). en
dc.rights.uri https://creativecommons.org/licenses/by/4.0/ en
dc.subject Active galactic nuclei en
dc.subject Relativistic jets en
dc.subject Magnetic fields en
dc.subject Radio interferometry en
dc.title Evidence for helical magnetic fields associated with AGN Jets and the action of a cosmic battery en
dc.type Article (peer-reviewed) en
dc.internal.authorcontactother Prof Denise Gabuzda, Department of Physics, University College Cork, Cork, Ireland. +353-21-490-3000 Email: d.gabuzda@ucc.ie en
dc.internal.availability Full text available en
dc.description.version Published Version en
dc.description.status Peer reviewed en
dc.identifier.journaltitle Galaxies en
dc.internal.IRISemailaddress d.gabuzda@ucc.ie en
dc.identifier.articleid 5 en


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© 2018 The Author. This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0). Except where otherwise noted, this item's license is described as © 2018 The Author. This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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