Are spine-sheath polarization structures in the jets of active galactic nuclei associated with helical magnetic fields?

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dc.contributor.authorGabuzda, Denise
dc.contributor.authorReichstein, A. R.
dc.contributor.authorO'Neill, E. L.
dc.contributor.funderNational Science Foundation
dc.date.accessioned2017-11-07T09:38:53Z
dc.date.available2017-11-07T09:38:53Z
dc.date.issued2014
dc.description.abstractOne possible origin for polarization structures across jets of active galactic nuclei (AGNs) with a central 'spine' of orthogonal magnetic field and a 'sheath' of longitudinal magnetic field along one or both edges of the jet is the presence of a helical jet magnetic field. Simultaneous Very Long Baseline Array (VLBA) polarization observations of AGN displaying partial or full spine-sheath polarization structures were obtained at 4.6, 5.0, 7.9, 8.9, 12.9 and 15.4 GHz, in order to search for additional evidence for helical jet magnetic fields, such as transverse Faraday rotation gradients (due to the systematic change in the line-of-sight magnetic-field component across the jet). Results for eight sources displaying monotonic transverse Faraday rotation gradients with significances >= 3 sigma are presented here. Reversals in the directions of the transverse RM gradients with distance from the core or with time are detected in three of these AGNs. These can be interpreted as evidence for a nested helical magnetic field structure, with different directions for the azimuthal field component in the inner and outer regions of helical field. The results presented here support the idea that many spine-sheath polarization structures reflect the presence of helical magnetic fields being carried by these jets.en
dc.description.sponsorshipNational Science Foundation (AST-0607523)en
dc.description.statusPeer revieweden
dc.description.versionPublished Versionen
dc.format.mimetypeapplication/pdfen
dc.identifier.citationGabuzda, D. C., Reichstein, A. R. and O'Neill, E. L. (2014) 'Are spine–sheath polarization structures in the jets of active galactic nuclei associated with helical magnetic fields?', Monthly Notices of the Royal Astronomical Society, 444(1), pp. 172-184. doi: 10.1093/mnras/stu1381en
dc.identifier.doi10.1093/mnras/stu1381
dc.identifier.endpage184
dc.identifier.issn0035-8711
dc.identifier.issn1365-2966
dc.identifier.issued1
dc.identifier.journaltitleMonthly Notices of the Royal Astronomical Societyen
dc.identifier.startpage172
dc.identifier.urihttp://hdl.handle.net/10468/4954
dc.identifier.volume444
dc.language.isoenen
dc.publisherOxford University Pressen
dc.relation.urihttps://academic.oup.com/mnras/article/444/1/172/1010641/Are-spinesheath-polarization-structures-in-the
dc.rights© 2014, the Authors. Published by Oxford University Press on behalf of the Royal Astronomical Societyen
dc.subjectMagnetic fieldsen
dc.subjectPolarizationen
dc.subjectGalaxiesen
dc.subjectActiveen
dc.subjectJetsen
dc.titleAre spine-sheath polarization structures in the jets of active galactic nuclei associated with helical magnetic fields?en
dc.typeArticle (peer-reviewed)en
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