dc.contributor.author | Stroe, Andra | |
dc.contributor.author | Rumsey, Clare | |
dc.contributor.author | Harwood, Jeremy J. | |
dc.contributor.author | Van weeren, Reinout J. | |
dc.contributor.author | Röttgering, Huub J.A. | |
dc.contributor.author | Saunders, Richard D.E. | |
dc.contributor.author | Sobral, David | |
dc.contributor.author | Perrott, Yvette C. | |
dc.contributor.author | Schammel, Michel P. | |
dc.date.accessioned | 2018-10-05T01:10:07Z | |
dc.date.available | 2018-10-05T01:10:07Z | |
dc.date.issued | 2014-06-11 | |
dc.identifier.citation | Stroe , 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.issn | 1745-3925 | |
dc.identifier.other | ORCID: /0000-0003-0251-6126/work/62748341 | |
dc.identifier.uri | http://hdl.handle.net/2299/20690 | |
dc.description | This 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.abstract | We 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.format.extent | 410952 | |
dc.language.iso | eng | |
dc.relation.ispartof | Monthly Notices of the Royal Astronomical Society: Letters | |
dc.subject | Acceleration of particles | |
dc.subject | Radiation mechanisms: Non-thermal | |
dc.subject | Radio continuum: General | |
dc.subject | Shock waves | |
dc.subject | Astronomy and Astrophysics | |
dc.subject | Space and Planetary Science | |
dc.title | The highest frequency detection of a radio relic : 16 GHz AMI observations of the 'Sausage' cluster | en |
dc.contributor.institution | School of Physics, Astronomy and Mathematics | |
dc.description.status | Peer reviewed | |
dc.identifier.url | http://www.scopus.com/inward/record.url?scp=84899917838&partnerID=8YFLogxK | |
dc.identifier.url | https://arxiv.org/abs/1403.4255 | |
rioxxterms.versionofrecord | 10.1093/mnrasl/slu045 | |
rioxxterms.type | Journal Article/Review | |
herts.preservation.rarelyaccessed | true | |