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dc.contributor.authorWykes, Sarka
dc.contributor.authorIntema, Huib T.
dc.contributor.authorHardcastle, M.J.
dc.contributor.authorAchterberg, Abraham
dc.contributor.authorJones, Thomas W.
dc.contributor.authorJerjen, Helmut
dc.contributor.authorOrrú, Emanuela
dc.contributor.authorLazarian, Alex
dc.contributor.authorShimwell, Timothy W.
dc.contributor.authorWise, Michael W.
dc.contributor.authorKronberg, Philipp P.
dc.date.accessioned2014-12-15T09:32:26Z
dc.date.available2014-12-15T09:32:26Z
dc.date.issued2014-08-21
dc.identifier.citationWykes , S , Intema , H T , Hardcastle , M J , Achterberg , A , Jones , T W , Jerjen , H , Orrú , E , Lazarian , A , Shimwell , T W , Wise , M W & Kronberg , P P 2014 , ' Filaments in the southern giant lobe of Centaurus A : Constraints on nature and origin from modelling and GMRT observations ' , Monthly Notices of the Royal Astronomical Society , vol. 442 , no. 4 , stu1033 , pp. 2867-2882 . https://doi.org/10.1093/mnras/stu1033
dc.identifier.issn0035-8711
dc.identifier.otherPURE: 7851608
dc.identifier.otherPURE UUID: 2f47d907-b855-4a97-a9fa-cfe9144faff5
dc.identifier.otherScopus: 84904556136
dc.identifier.urihttp://hdl.handle.net/2299/14935
dc.descriptionDate of acceptance: 22/05/2014
dc.description.abstractWe present results from imaging of the radio filaments in the southern giant lobe of CentaurusA using data from Giant Metrewave Radio Telescope observations at 325 and 235 MHz, and outcomes from filament modelling. The observations reveal a rich filamentary structure, largely matching the morphology at 1.4 GHz. We find no clear connection of the filaments to the jet. We seek to constrain the nature and origin of the vertex and vortex filaments associated with the lobe and their role in high-energy particle acceleration. We deduce that these filaments are at most mildly overpressuredwith respect to the global lobe plasma showing no evidence of largescale efficient Fermi I-type particle acceleration, and persist for ~2-3 Myr. We demonstrate that the dwarf galaxy KK 196 (AM 1318-444) cannot account for the features, and that surface plasma instabilities, the internal sausage mode and radiative instabilities are highly unlikely. An internal tearing instability and the kink mode are allowed within the observational and growth time constraints and could develop in parallel on different physical scales. We interpret the origin of the vertex and vortex filaments in terms of weak shocks from transonic magnetohydrodynamical turbulence or from a moderately recent jet activity of the parent AGN, or an interplay of both.en
dc.format.extent16
dc.language.isoeng
dc.relation.ispartofMonthly Notices of the Royal Astronomical Society
dc.rightsOpen
dc.subjectGalaxies: individual (Centaurus A)
dc.subjectGalaxies: jets
dc.subjectInstabilities
dc.subjectRadio continuum: galaxies
dc.subjectTechniques: image processing
dc.subjectTurbulence
dc.subjectSpace and Planetary Science
dc.subjectAstronomy and Astrophysics
dc.titleFilaments in the southern giant lobe of Centaurus A : Constraints on nature and origin from modelling and GMRT observationsen
dc.contributor.institutionSchool of Physics, Astronomy and Mathematics
dc.contributor.institutionScience & Technology Research Institute
dc.contributor.institutionCentre for Astrophysics Research
dc.description.statusPeer reviewed
dc.relation.schoolSchool of Physics, Astronomy and Mathematics
dc.description.versiontypeFinal Accepted Version
dcterms.dateAccepted2014-08-21
rioxxterms.versionAM
rioxxterms.versionofrecordhttps://doi.org/10.1093/mnras/stu1033
rioxxterms.typeJournal Article/Review
herts.preservation.rarelyaccessedtrue
herts.rights.accesstypeOpen


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