Scaife, Anna M.M.Oozeer, NadeemDe Gasperin, FrancescoBrüggen, MarcusTasse, Cyril2016-08-262016-08-262015Scaife, A.M.M. et al. 2015. KAT-7 detection of radio halo emission in the Triangulum Australis galaxy cluster. Monthly notices of the Royal Astronomical Society, 451(4):4021-4028. [http://mnras.oxfordjournals.org]0035-87111365-2966 (Online)http://hdl.handle.net/10394/18420http://dx.doi.org/10.1093/mnras/stv911http://mnras.oxfordjournals.org/content/451/4/4021.full.pdf+htmlWe report the presence of high significance diffuse radio emission from the Triangulum Australis cluster using observations made with the KAT-7 telescope and propose that this emission is a giant radio halo. We compare the radio power from this proposed halo with X-ray and SZ (Sunyaev–Zel'dovich) measurements and demonstrate that it is consistent with the established scaling relations for cluster haloes. By combining the X-ray and SZ data we calculate the ratio of non-thermal to thermal electron pressure within Triangulum Australis to be X = 0.658 ± 0.054. We use this ratio to constrain the maximum magnetic field strength within the halo region to be Bmax, halo = 33.08 μG and compare this with the minimum field strength from equipartition of Bmin, halo = 0.77(1 + k)2/7 μG to place limits on the range of allowed magnetic field strength within this cluster. We compare these values to those for more well-studied systems and discuss these results in the context of equipartition of non-thermal energy densities within clusters of galaxiesenGalaxies: clusters: individual: Triangulum Australisgalaxies: clusters: intracluster mediumArticle