{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,1,5]],"date-time":"2026-01-05T21:31:47Z","timestamp":1767648707499},"reference-count":25,"publisher":"Oxford University Press (OUP)","issue":"1","content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":[],"published-print":{"date-parts":[[2014,6,11]]},"abstract":"<jats:title>Abstract<\/jats:title>\n               <jats:p>We observed the cluster CIZA J2242.8+5301 with the Arcminute Microkelvin Imager at 16\u00a0GHz 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\u00a0\u00b1\u00a00.3\u2009mJy. While the low-frequency (&amp;lt;2\u00a0GHz) spectrum of the northern relic is well represented by a power law, it clearly steepens towards 16\u00a0GHz. 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.<\/jats:p>","DOI":"10.1093\/mnrasl\/slu045","type":"journal-article","created":{"date-parts":[[2014,4,16]],"date-time":"2014-04-16T06:35:33Z","timestamp":1397630133000},"page":"L41-L45","source":"Crossref","is-referenced-by-count":35,"title":["The highest frequency detection of a radio relic: 16\u00a0GHz AMI observations of the \u2018Sausage\u2019 cluster"],"prefix":"10.1093","volume":"441","author":[{"given":"Andra","family":"Stroe","sequence":"first","affiliation":[{"name":"1Leiden Observatory, Leiden University, PO Box 9513, NL-2300 RA Leiden, the Netherlands"}]},{"given":"Clare","family":"Rumsey","sequence":"additional","affiliation":[{"name":"2Astrophysics Group, Cavendish Laboratory, JJ Thomson Avenue, Cambridge CB3 0HE, UK"}]},{"given":"Jeremy J.","family":"Harwood","sequence":"additional","affiliation":[{"name":"3School of Physics, Astronomy and Mathematics, University of Hertfordshire, College Lane, Hatfield, Hertfordshire AL10 9AB, UK"}]},{"given":"Reinout J.","family":"van Weeren","sequence":"additional","affiliation":[{"name":"4Harvard Smithsonian Center for Astrophysics (CfA - SAO), 60 Garden Street Cambridge, MA 02138, USA"}]},{"given":"Huub J.\u00a0A.","family":"R\u00f6ttgering","sequence":"additional","affiliation":[{"name":"1Leiden Observatory, Leiden University, PO Box 9513, NL-2300 RA Leiden, the Netherlands"}]},{"given":"Richard D. 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