Determining the jet poloidal B field and black-hole rotation directions in AGNs

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dc.contributor.author Gabuzda, Denise
dc.date.accessioned 2018-02-20T13:24:12Z
dc.date.available 2018-02-20T13:24:12Z
dc.date.issued 2018
dc.identifier.citation Gabuzda, D. (2018) 'Determining the jet poloidal B field and black-hole rotation directions in AGNs', Galaxies, 6(1), 9 (6pp). doi: 10.3390/galaxies6010009 en
dc.identifier.volume 6
dc.identifier.issued 1
dc.identifier.startpage 1
dc.identifier.endpage 6
dc.identifier.issn 2075-4434
dc.identifier.uri http://hdl.handle.net/10468/5501
dc.identifier.doi 10.3390/galaxies6010009
dc.description.abstract It is theoretically expected that active galactic nucleus (AGN) jets should carry helical magnetic (B) fields, which arise due to the rotation of the central black hole and accretion disk combined with the jet outflow. The direction of the toroidal component of the helical B field Bφ is determined by the direction of the poloidal component Bp of the initial seed field that is “wound up” and the direction of rotation of the central black hole and accretion disk. The presence of the jet’s helical B field can be manifest both through the presence of Faraday rotation gradients across the jet, and the presence of appreciable circular polarization, which comes about when linearly polarized emission from the far side of the jet is partially converted to circularly polarized emission as it passes through the magnetized plasma at the front side of the jet on its way towards the observer. When both of these properties are manifest, they can be used jointly with the jet linear polarization structure to uniquely determine both the direction of Bp and the direction of the central rotation. This technique has been applied to 12 AGNs. The results indicate statistically equal numbers of outward and inward Bp and of clockwise (CW) and counter-clockwise (CCW) rotations of the central black holes on the sky. However, they suggest that the directions of Bp and of the central rotation are coupled: CW/CCW central rotation is preferentially associated with inward/outward poloidal B field. This leads to a preferred orientation for the toroidal B-field component corresponding to inward current along the jet en
dc.format.mimetype application/pdf en
dc.language.iso en en
dc.publisher MDPI AG en
dc.relation.uri http://www.mdpi.com/2075-4434/6/1/9
dc.rights © 2018, the Author. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/). en
dc.rights.uri http://creativecommons.org/licenses/by/4.0/
dc.subject Active galactic nuclei en
dc.subject Relativistic jets en
dc.subject Magnetic fields en
dc.subject Radio interferometry en
dc.title Determining the jet poloidal B field and black-hole rotation directions in AGNs en
dc.type Article (peer-reviewed) en
dc.internal.authorcontactother Denise Gabuzda, 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 9


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© 2018, the Author. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/). Except where otherwise noted, this item's license is described as © 2018, the Author. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
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