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dc.contributor.authorStroe, A.
dc.contributor.authorHarwood, Jeremy
dc.contributor.authorHardcastle, M.J.
dc.contributor.authorRottgering, H.J.A.
dc.date.accessioned2016-03-16T10:13:35Z
dc.date.available2016-03-16T10:13:35Z
dc.date.issued2014-12-01
dc.identifier.citationStroe , A , Harwood , J , Hardcastle , M J & Rottgering , H J A 2014 , ' Spectral age modelling of the 'Sausage' cluster radio relic ' , Monthly Notices of the Royal Astronomical Society , vol. 445 , no. 2 , pp. 1213-1222 . https://doi.org/10.1093/mnras/stu1839
dc.identifier.issn0035-8711
dc.identifier.otherPURE: 9608358
dc.identifier.otherPURE UUID: 02f65981-9381-484f-8cf8-e5726926771f
dc.identifier.otherScopus: 84987984224
dc.identifier.otherORCID: /0000-0003-0251-6126/work/62748338
dc.identifier.urihttp://hdl.handle.net/2299/16768
dc.description.abstractCIZA J2242.8+5301 is a post-core passage, binary merging cluster that hosts a large, thin, arc-like radio relic, nicknamed the 'Sausage', tracing a relatively strong shock front. We perform spatially resolved spectral fitting to the available radio data for this radio relic, using a variety of spectral ageing models, with the aim of finding a consistent set of parameters for the shock and radio plasma. We determine an injection index of 0.77(-0.02)(+0.03) for the relic plasma, significantly steeper than was found before. Standard particle acceleration at the shock front implies a Mach number M = 2.90(-0.13)(+0.10), which now matches X-ray measurements. The shock advance speed is v(shock) approximate to 2500 km s(-1), which places the core passage of the two subclusters 0.6-0.8 Gyr ago. We find a systematic spectral age increase from 0 at the northern side of the relic up to similar to 60 Myr at similar to 145 kpc into the downstream area, assuming a 0.6 nT magnetic field. Under the assumption of freely ageing electrons after acceleration by the 'Sausage' shock, the spectral ages are hard to reconcile with the shock speed derived from X-ray and radio observations. Re-acceleration or unusually efficient transport of particle in the downstream area and line-of-sight mixing could help explain the systematically low spectral agesen
dc.language.isoeng
dc.relation.ispartofMonthly Notices of the Royal Astronomical Society
dc.titleSpectral age modelling of the 'Sausage' cluster radio relicen
dc.contributor.institutionSchool of Physics, Astronomy and Mathematics
dc.contributor.institutionScience & Technology Research Institute
dc.contributor.institutionCentre for Astrophysics Research
dc.description.statusPeer reviewed
rioxxterms.versionAM
rioxxterms.versionofrecordhttps://doi.org/10.1093/mnras/stu1839
rioxxterms.typeJournal Article/Review
herts.preservation.rarelyaccessedtrue


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