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dc.contributor.authorStroe, Andra
dc.contributor.authorRumsey, Clare
dc.contributor.authorHarwood, Jeremy J.
dc.contributor.authorVan weeren, Reinout J.
dc.contributor.authorRöttgering, Huub J.A.
dc.contributor.authorSaunders, Richard D.E.
dc.contributor.authorSobral, David
dc.contributor.authorPerrott, Yvette C.
dc.contributor.authorSchammel, Michel P.
dc.date.accessioned2018-10-05T01:10:07Z
dc.date.available2018-10-05T01:10:07Z
dc.date.issued2014-06-11
dc.identifier.citationStroe , A , Rumsey , C , Harwood , J J , Van weeren , R J , Röttgering , H J A , Saunders , R D E , Sobral , D , Perrott , Y C & Schammel , M P 2014 , ' The highest frequency detection of a radio relic : 16 GHz AMI observations of the 'Sausage' cluster ' , Monthly Notices of the Royal Astronomical Society: Letters , vol. 441 , no. 1 , slu045 , pp. L41–L45 . https://doi.org/10.1093/mnrasl/slu045
dc.identifier.issn1745-3925
dc.identifier.otherPURE: 14960238
dc.identifier.otherPURE UUID: d62ffda4-ddee-478e-a0fb-1008e8f1e068
dc.identifier.otherScopus: 84899917838
dc.identifier.otherORCID: /0000-0003-0251-6126/work/62748341
dc.identifier.urihttp://hdl.handle.net/2299/20690
dc.descriptionThis article has been accepted for publication in Monthly Notices of the Royal Astronomical Society: Letters. © 2014 The Author(s). Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.
dc.description.abstractWe observed the cluster CIZA J2242.8+5301 with the Arcminute Microkelvin Imager at 16 GHz and present the first high radio-frequency detection of diffuse, non-thermal cluster emission. This cluster hosts a variety of bright, extended, steep-spectrum synchrotron-emitting radio sources, associated with the intracluster medium, called radio relics. Most notably, the northern, Mpc-wide, narrow relic provides strong evidence for diffusive shock acceleration in clusters. We detect a puzzling, flat-spectrum, diffuse extension of the southern relic, which is not visible in the lower radio-frequency maps. The northern radio relic is unequivocally detected and measures an integrated flux of 1.2 ± 0.3 mJy. While the low-frequency (<2 GHz) spectrum of the northern relic is well represented by a power law, it clearly steepens towards 16 GHz. This result is inconsistent with diffusive shock acceleration predictions of ageing plasma behind a uniform shock front. The steepening could be caused by an inhomogeneous medium with temperature/density gradients or by lower acceleration efficiencies of high energy electrons. Further modelling is necessary to explain the observed spectrum.en
dc.language.isoeng
dc.relation.ispartofMonthly Notices of the Royal Astronomical Society: Letters
dc.subjectAcceleration of particles
dc.subjectRadiation mechanisms: Non-thermal
dc.subjectRadio continuum: General
dc.subjectShock waves
dc.subjectAstronomy and Astrophysics
dc.subjectSpace and Planetary Science
dc.titleThe highest frequency detection of a radio relic : 16 GHz AMI observations of the 'Sausage' clusteren
dc.contributor.institutionSchool of Physics, Astronomy and Mathematics
dc.contributor.institutionCentre for Astrophysics Research
dc.description.statusPeer reviewed
dc.identifier.urlhttp://www.scopus.com/inward/record.url?scp=84899917838&partnerID=8YFLogxK
dc.identifier.urlhttps://arxiv.org/abs/1403.4255
rioxxterms.versionAM
rioxxterms.versionofrecordhttps://doi.org/10.1093/mnrasl/slu045
rioxxterms.typeJournal Article/Review
herts.preservation.rarelyaccessedtrue


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