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dc.contributor.authorGeorge, L. T.
dc.contributor.authorDwarakanath, K. S.
dc.contributor.authorJohnston-Hollitt, M.
dc.contributor.authorIntema, H. T.
dc.contributor.authorHurley-Walker, N.
dc.contributor.authorBell, M. E.
dc.contributor.authorCallingham, J. R.
dc.contributor.authorFor, Bi-Qing
dc.contributor.authorGaensler, B.
dc.contributor.authorHancock, P. J.
dc.contributor.authorHindson, Luke
dc.contributor.authorKapińska, A. D.
dc.contributor.authorLenc, E.
dc.contributor.authorMcKinley, B.
dc.contributor.authorMorgan, J.
dc.contributor.authorOffringa, A.
dc.contributor.authorProcopio, P.
dc.contributor.authorStaveley-Smith, L.
dc.contributor.authorWayth, R. B.
dc.contributor.authorWu, Chen
dc.contributor.authorZheng, Q.
dc.date.accessioned2017-06-06T16:29:17Z
dc.date.available2017-06-06T16:29:17Z
dc.date.issued2017-05-01
dc.identifier.citationGeorge , 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.issn0035-8711
dc.identifier.otherPURE: 11154612
dc.identifier.otherPURE UUID: 50729e1d-9712-41d0-af2f-ed78e625697d
dc.identifier.otherArXiv: http://arxiv.org/abs/1701.06742v1
dc.identifier.otherScopus: 85052509226
dc.identifier.urihttp://hdl.handle.net/2299/18290
dc.descriptionThis 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.abstractWe 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.extent14
dc.language.isoeng
dc.relation.ispartofMonthly Notices of the Royal Astronomical Society
dc.rightsOpen
dc.subjectradiation mechanisms: non-thermal
dc.subjecttechniques: interferometric
dc.subjectgalaxies: clusters: general
dc.subjectgalaxies: clusters: intracluster medium
dc.subjectradio continuum: general
dc.subjectX-rays: galaxies: clusters
dc.titleA study of halo and relic radio emission in merging clusters using the Murchison Widefield Arrayen
dc.contributor.institutionSchool of Physics, Astronomy and Mathematics
dc.description.statusPeer reviewed
dc.description.versiontypeFinal Published version
dcterms.dateAccepted2017-05-01
rioxxterms.versionVoR
rioxxterms.versionofrecordhttps://doi.org/10.1093/mnras/stx155
rioxxterms.typeJournal Article/Review
herts.preservation.rarelyaccessedtrue
herts.rights.accesstypeOpen


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