Analysing the transverse structure of the relativistic jets of active galactic nuclei

Show simple item record Murphy, Eoin Gerard Cawthorne, T. V. Gabuzda, Denise 2017-11-07T09:38:54Z 2017-11-07T09:38:54Z 2013
dc.identifier.citation Murphy, E., Cawthorne, T. V. and Gabuzda, D. C. (2013) 'Analysing the transverse structure of the relativistic jets of active galactic nuclei', Monthly Notices of the Royal Astronomical Society, 430(3), pp. 1504-1515. doi: 10.1093/mnras/sts561 en
dc.identifier.volume 430
dc.identifier.issued 3
dc.identifier.startpage 1504
dc.identifier.endpage 1515
dc.identifier.issn 0035-8711
dc.identifier.issn 1365-2966
dc.identifier.doi 10.1093/mnras/sts561
dc.description.abstract This paper describes a method of fitting total intensity and polarization profiles in very long baseline interferometry (VLBI) images of astrophysical jets to profiles predicted by a theoretical model. As an example, the method is used to fit profiles of the jet in the active galactic nucleus (AGN) Mrk 501 with profiles predicted by a model in which a cylindrical jet of synchrotron plasma is threaded by a magnetic field with helical and disordered components. This fitting yields model Stokes Q profiles that agree with the observed profiles to within the 1-2 sigma uncertainties; the I model and observed profiles are overall not in such good agreement, with the model I profiles being generally more symmetrical than the observed profiles. Consistent fitting results are obtained for profiles derived from 6-cm VLBI images at two distances from the core, and also for profiles obtained for different wavelengths at a single location in the VLBI jet. The most striking success of the model is its ability to reproduce the spine-sheath polarization structure observed across the jet. Using the derived viewing angle in the jet rest frame, delta' similar or equal to 83 degrees, together with a superluminal speed reported in the literature, beta(app) = 3.3, yields a solution for the viewing angle and velocity of the jet in the observer's frame, delta similar or equal to 15 degrees and beta similar or equal to 0.96. Although these results for Mrk 501 must be considered tentative, the combined analysis of polarization profiles and apparent component speeds holds promise as a means of further elucidating the magnetic field structures and other parameters of parsec-scale AGN jets. en
dc.format.mimetype application/pdf en
dc.language.iso en en
dc.publisher Oxford University Press en
dc.rights © 2013, the Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society en
dc.subject Galaxies en
dc.subject Active en
dc.subject Jets en
dc.title Analysing the transverse structure of the relativistic jets of active galactic nuclei en
dc.type Article (peer-reviewed) en
dc.internal.authorcontactother Eoin Gerard Murphy, Physics, University College Cork, Cork, Ireland. +353-21-490-3000 Email: en
dc.internal.availability Full text available en
dc.description.version Published Version en
dc.contributor.funder Irish Research Council for Science, Engineering and Technology
dc.description.status Peer reviewed en
dc.identifier.journaltitle Monthly Notices of the Royal Astronomical Society en
dc.internal.IRISemailaddress en

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