dc.contributor.author | Stroe, A. | |
dc.contributor.author | Harwood, Jeremy | |
dc.contributor.author | Hardcastle, M.J. | |
dc.contributor.author | Rottgering, H.J.A. | |
dc.date.accessioned | 2016-03-16T10:13:35Z | |
dc.date.available | 2016-03-16T10:13:35Z | |
dc.date.issued | 2014-12-01 | |
dc.identifier.citation | Stroe , 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.issn | 0035-8711 | |
dc.identifier.other | ORCID: /0000-0003-0251-6126/work/62748338 | |
dc.identifier.uri | http://hdl.handle.net/2299/16768 | |
dc.description.abstract | CIZA 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 ages | en |
dc.format.extent | 892421 | |
dc.language.iso | eng | |
dc.relation.ispartof | Monthly Notices of the Royal Astronomical Society | |
dc.title | Spectral age modelling of the 'Sausage' cluster radio relic | en |
dc.contributor.institution | School of Physics, Astronomy and Mathematics | |
dc.contributor.institution | Centre for Astrophysics Research (CAR) | |
dc.description.status | Peer reviewed | |
rioxxterms.versionofrecord | 10.1093/mnras/stu1839 | |
rioxxterms.type | Journal Article/Review | |
herts.preservation.rarelyaccessed | true | |