dc.contributor.author George, L. T. dc.contributor.author Dwarakanath, K. S. dc.contributor.author Johnston-Hollitt, M. dc.contributor.author Intema, H. T. dc.contributor.author Hurley-Walker, N. dc.contributor.author Bell, M. E. dc.contributor.author Callingham, J. R. dc.contributor.author For, Bi-Qing dc.contributor.author Gaensler, B. dc.contributor.author Hancock, P. J. dc.contributor.author Hindson, Luke dc.contributor.author Kapińska, A. D. dc.contributor.author Lenc, E. dc.contributor.author McKinley, B. dc.contributor.author Morgan, J. dc.contributor.author Offringa, A. dc.contributor.author Procopio, P. dc.contributor.author Staveley-Smith, L. dc.contributor.author Wayth, R. B. dc.contributor.author Wu, Chen dc.contributor.author Zheng, Q. dc.date.accessioned 2017-06-06T16:29:17Z dc.date.available 2017-06-06T16:29:17Z dc.date.issued 2017-05-01 dc.identifier.citation George , L T , Dwarakanath , K S , Johnston-Hollitt , M , Intema , H T , Hurley-Walker , N , Bell , M E , Callingham , J R , For , B-Q , Gaensler , B , Hancock , P J , Hindson , L , Kapińska , A D , Lenc , E , McKinley , B , Morgan , J , Offringa , A , Procopio , P , Staveley-Smith , L , Wayth , R B , Wu , C & Zheng , Q 2017 , ' A study of halo and relic radio emission in merging clusters using the Murchison Widefield Array ' , Monthly Notices of the Royal Astronomical Society , vol. 467 , no. 1 , pp. 936-949 . https://doi.org/10.1093/mnras/stx155 dc.identifier.issn 0035-8711 dc.identifier.other PURE: 11154612 dc.identifier.other PURE UUID: 50729e1d-9712-41d0-af2f-ed78e625697d dc.identifier.other ArXiv: http://arxiv.org/abs/1701.06742v1 dc.identifier.other Scopus: 85052509226 dc.identifier.uri http://hdl.handle.net/2299/18290 dc.description This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society. © 2017 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. dc.description.abstract We have studied radio haloes and relics in nine merging galaxy clusters using the Murchison Widefield Array (MWA). The images used for this study were obtained from the GaLactic and Extragalactic All-sky MWA (GLEAM) Survey which was carried out at 5 frequencies, viz. 88, 118, 154, 188 and 215 MHz. We detect diffuse radio emission in 8 of these clusters. We have estimated the spectra of haloes and relics in these clusters over the frequency range 80-1400 MHz; the first such attempt to estimate their spectra at low frequencies. The spectra follow a power law with a mean value of $\alpha = -1.13\pm0.21$ for haloes and $\alpha = -1.2\pm0.19$ for relics where, $S \propto \nu^{\alpha}$. We reclassify two of the cluster sources as radio galaxies. The low frequency spectra are thus an independent means of confirming the nature of cluster sources. Five of the nine clusters host radio haloes. For the remaining four clusters, we place upper limits on the radio powers of possible haloes in them. These upper limits are a factor of 2-20 below those expected from the $L_{\rm X}-P_{\rm 1.4}$ relation. These limits are the lowest ever obtained and the implications of these limits to the hadronic model of halo emission are discussed. en dc.format.extent 14 dc.language.iso eng dc.relation.ispartof Monthly Notices of the Royal Astronomical Society dc.rights Open dc.subject radiation mechanisms: non-thermal dc.subject techniques: interferometric dc.subject galaxies: clusters: general dc.subject galaxies: clusters: intracluster medium dc.subject radio continuum: general dc.subject X-rays: galaxies: clusters dc.title A study of halo and relic radio emission in merging clusters using the Murchison Widefield Array en dc.contributor.institution School of Physics, Astronomy and Mathematics dc.description.status Peer reviewed dc.description.versiontype Final Published version dcterms.dateAccepted 2017-05-01 rioxxterms.version VoR rioxxterms.versionofrecord https://doi.org/10.1093/mnras/stx155 rioxxterms.type Journal Article/Review herts.preservation.rarelyaccessed true herts.rights.accesstype Open
﻿