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dc.contributor.authorGranot, Jonathan
dc.date.accessioned2012-04-12T08:58:05Z
dc.date.available2012-04-12T08:58:05Z
dc.date.issued2012
dc.identifier.citationGranot , J 2012 , ' Interaction of a highly magnetized impulsive relativistic flow with an external medium ' , Monthly Notices of the Royal Astronomical Society , vol. 421 , no. 3 , pp. 2442-2466 . https://doi.org/10.1111/j.1365-2966.2012.20473.x
dc.identifier.issn0035-8711
dc.identifier.otherPURE: 778734
dc.identifier.otherPURE UUID: 9327d4bc-2c21-4e92-8088-3c3980b82dd5
dc.identifier.otherArXiv: http://arxiv.org/abs/1109.5314v2
dc.identifier.otherScopus: 84859428847
dc.identifier.urihttp://hdl.handle.net/2299/8300
dc.description.abstractImportant astrophysical sources, such as gamma-ray bursts (GRBs) or tidal disruption events, are impulsive -- strongly varying with time. These outflows are likely highly magnetized near the central source, but their interaction with the external medium is not yet fully understood. Here I consider the combined impulsive magnetic acceleration of an initially highly magnetized shell of plasma and its deceleration by the external medium. I find four main dynamical regimes, that (for a given outflow) depend on the external density. (I) For small enough external densities the shell becomes kinetically dominated before it is significantly decelerated, thus reverting to the familiar unmagnetized "thin shell" case, which produces bright reverse shock emission that peaks well after the prompt GRB. (II) For larger external densities the shell remains highly magnetized and the reverse shock is strongly suppressed. It eventually transfers most of its energy through pdV work to the shocked external medium, whose afterglow emission peaks on a timescale similar to the prompt GRB duration. (III) For even larger external densities there is no initial impulsive acceleration phase. (IV) For the highest external densities the flow remains Newtonian.en
dc.language.isoeng
dc.relation.ispartofMonthly Notices of the Royal Astronomical Society
dc.rightsOpen
dc.subjectastro-ph.HE
dc.titleInteraction of a highly magnetized impulsive relativistic flow with an external mediumen
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.dateAccepted2012
rioxxterms.versionAM
rioxxterms.versionofrecordhttps://doi.org/10.1111/j.1365-2966.2012.20473.x
rioxxterms.typeJournal Article/Review
herts.preservation.rarelyaccessedtrue
herts.rights.accesstypeOpen


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