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dc.contributor.authorKim, J.-Y.en_US
dc.contributor.authorKrichbaum, T. P.en_US
dc.contributor.authorMarscher, Alan P.en_US
dc.contributor.authorJorstad, Svetlana G.en_US
dc.contributor.authorAgudo, I.en_US
dc.contributor.authorThum, C.en_US
dc.contributor.authorHodgson, J. A.en_US
dc.contributor.authorMacDonald, Nicholas Royen_US
dc.contributor.authorRos, E.en_US
dc.contributor.authorLu, R.-S.en_US
dc.contributor.authorBremer, M.en_US
dc.contributor.authorVicente, P. deen_US
dc.contributor.authorLindqvist, M.en_US
dc.contributor.authorTrippe, S.en_US
dc.contributor.authorZensus, J. A.en_US
dc.date.accessioned2019-02-20T14:18:07Z
dc.date.available2019-02-20T14:18:07Z
dc.identifierhttp://arxiv.org/abs/1811.07815v1
dc.identifier.citationJ-Y Kim, TP Krichbaum, AP Marscher, SG Jorstad, I Agudo, C Thum, JA Hodgson, NR MacDonald, E Ros, R-S Lu, M Bremer, P de Vicente, M Lindqvist, S Trippe, JA Zensus. "Spatially resolved origin of mm-wave linear polarization in the nuclear region of 3C 84."
dc.identifier.urihttps://hdl.handle.net/2144/33338
dc.description.abstractWe report results from a deep polarization imaging of the nearby radio galaxy 3C 84 (NGC 1275). The source was observed with the Global Millimeter VLBI Array (GMVA) at 86 GHz at an ultra-high angular resolution of 50μas (corresponding to 250R𝒔). We also add complementary multi-wavelength data from the Very Long Baseline Array (VLBA; 15 & 43 GHz) and from the Atacama Large Millimeter/submillimeter Array (ALMA; 97.5, 233.0, and 343.5 GHz). At 86 GHz, we measure a fractional linear polarization of ~ 2% in the VLBI core region. The polarization morphology suggests that the emission is associated with an underlying limb-brightened jet. The fractional linear polarization is lower at 43 and 15 GHz (~ 0.3-0.7% and < 0.1%, respectively). This suggests an increasing linear polarization degree towards shorter wavelengths on VLBI scales. We also obtain a large rotation measure (RM) of ~ 10⁵⁻⁶ rad/m² in the core at ≳43 GHz. Moreover, the VLBA 43 GHz observations show a variable RM in the VLBI core region during a small flare in 2015. Faraday depolarization and Faraday conversion in an inhomogeneous and mildly relativistic plasma could explain the observed linear polarization characteristics and the previously measured frequency dependence of the circular polarization. Our Faraday depolarization modeling suggests that the RM most likely originates from an external screen with a highly uniform RM distribution. To explain the large RM value, the uniform RM distribution, and the RM variability, we suggest that the Faraday rotation is caused by a boundary layer in a transversely stratified jet. Based on the RM and the synchrotron spectrum of the core, we provide an estimate for the magnetic field strength and the electron density of the jet plasma.en_US
dc.language.isoen_US
dc.rights© Copyright 2018 ESO.en_US
dc.subjectGalaxies: activeen_US
dc.subjectGalaxies: jetsen_US
dc.subjectTechniques: interferonic, polarimetricen_US
dc.subjectGalaxies: individual (NGC 1275, 3C 84)en_US
dc.titleSpatially resolved origin of mm-wave linear polarization in the nuclear region of 3C 84en_US
dc.typeArticleen_US
dc.description.versionAccepted manuscripten_US
pubs.elements-sourcearxiven_US
pubs.notes19 pages, 17 figures, 8 tables, accepted for publication in Astronomy & Astrophysicsen_US
pubs.notesEmbargo: No embargoen_US
pubs.organisational-groupBoston Universityen_US
pubs.organisational-groupBoston University, College of Arts & Sciencesen_US
pubs.organisational-groupBoston University, College of Arts & Sciences, Department of Astronomyen_US
dc.identifier.orcid0000-0001-7396-3332 (Marscher, AP)


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