The parsec-scale distributions of intensity, linear polarization and Faraday rotation in the core and jet of Mrk 501 at 8.4-1.6 GHz

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dc.contributor.author Croke, S. M.
dc.contributor.author O'Sullivan, Shane P.
dc.contributor.author Gabuzda, Denise
dc.date.accessioned 2017-11-07T09:38:55Z
dc.date.available 2017-11-07T09:38:55Z
dc.date.issued 2010
dc.identifier.citation Croke, S. M., O'Sullivan, S. P. and Gabuzda, D. C. (2010) 'The parsec-scale distributions of intensity, linear polarization and Faraday rotation in the core and jet of Mrk 501 at 8.4–1.6 GHz', Monthly Notices of the Royal Astronomical Society, 402(1), pp. 259-270. doi:10.1111/j.1365-2966.2009.15923.x en
dc.identifier.volume 402
dc.identifier.issued 1
dc.identifier.startpage 259
dc.identifier.endpage 270
dc.identifier.issn 0035-8711
dc.identifier.uri http://hdl.handle.net/10468/4966
dc.identifier.doi 10.1111/j.1365-2966.2009.15923.x
dc.description.abstract Previous very long baseline interferometry (VLBI) observations of the nearby (z = 0.0337) active galactic nucleus (AGN) Mrk 501 have revealed a complex total-intensity structure with an approximately 90 degrees misalignment between the jet orientations on parsec and kiloparsec scales. The jet displays a 'spine' of magnetic field orthogonal to the jet surrounded by a 'sheath' of magnetic field aligned with the jet. Mrk 501 is also one of a handful of AGN that are regularly detected at TeV energies, indicating the presence of high-energy phenomena in the core. However, multi-epoch analyses of the VLBI total-intensity structure have yielded only very modest apparent speeds for features in the VLBI jet. We investigate the total-intensity and linear-polarization structures of the parsec- to decaparsec-scale jet of Mrk 501 using VLBA observations at 8.4, 5, 2.2 and 1.6 GHz. The rotation-measure distribution displays the presence of a Faraday rotation gradient across an extended stretch of the jet, providing new evidence for a helical magnetic field associated with the jet of this AGN. The position of the radio core from the base of the jet follows the law r(core)(nu) proportional to nu-1.1 +/- 0.2, consistent with the compact inner jet region being in equipartition. Hence, we estimate a magnetic field strength of similar to 40 mG at a distance of 1 pc. en
dc.format.mimetype application/pdf en
dc.language.iso en en
dc.publisher Oxford University Press en
dc.relation.uri https://academic.oup.com/mnras/article-lookup/doi/10.1111/j.1365-2966.2009.15923.x
dc.rights © 2009, the Authors. Journal compilation © 2009, RAS en
dc.subject Galaxies en
dc.subject Active en
dc.subject Jets en
dc.subject Magnetic fields en
dc.title The parsec-scale distributions of intensity, linear polarization and Faraday rotation in the core and jet of Mrk 501 at 8.4-1.6 GHz en
dc.type Article (peer-reviewed) en
dc.internal.authorcontactother Shane O'Sullivan, Physics, University College Cork, Cork, Ireland. +353-21-490-3000 Email:shaneosullivan@phys.ucc.ie 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.contributor.funder National Science Foundation
dc.contributor.funder University of Michigan
dc.description.status Peer reviewed en
dc.identifier.journaltitle Monthly Notices of the Royal Astronomical Society en
dc.internal.IRISemailaddress shaneosullivan@phys.ucc.ie en


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