dc.contributor.author George, L. dc.contributor.author Dwarakanath, K. dc.contributor.author Johnston-Hollitt, M. dc.contributor.author Intema, H. dc.contributor.author Hurley-Walker, Natasha dc.contributor.author Bell, M. dc.contributor.author Callingham, J. dc.contributor.author For, B. dc.contributor.author Gaensler, B. dc.contributor.author Hancock, Paul dc.contributor.author Hindson, L. dc.contributor.author Kapinska, A. 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, Randall dc.contributor.author Wu, C. dc.contributor.author Zheng, Q. dc.date.accessioned 2017-06-23T03:00:34Z dc.date.available 2017-06-23T03:00:34Z dc.date.created 2017-06-19T03:39:34Z dc.date.issued 2017 dc.identifier.citation George, L. and Dwarakanath, K. and Johnston-Hollitt, M. and Intema, H. and Hurley-Walker, N. and Bell, M. and Callingham, J. et al. 2017. A study of halo and relic radio emission in merging clusters using the Murchison Widefield Array. Monthly Notices of the Royal Astronomical Society. 467 (1): pp. 936-949. dc.identifier.uri http://hdl.handle.net/20.500.11937/53576 dc.identifier.doi 10.1093/mnras/stx155 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. dc.publisher Oxford University Press dc.title A study of halo and relic radio emission in merging clusters using the Murchison Widefield Array dc.type Journal Article dcterms.source.volume 467 dcterms.source.number 1 dcterms.source.startPage 936 dcterms.source.endPage 949 dcterms.source.issn 0035-8711 dcterms.source.title Monthly Notices of the Royal Astronomical Society curtin.note 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. All rights reserved. curtin.department Curtin Institute of Radio Astronomy (Physics) curtin.accessStatus Open access
﻿