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We report the presence of high significance diffuse radio emission from theTriangulum Australis cluster using observations made with the KAT-7 telescopeand propose that this emission is a giant radio halo. We compare the radiopower from this proposed halo with X-ray and SZ measurements and demonstratethat it is consistent with the established scaling relations for clusterhaloes. By combining the X-ray and SZ data we calculate the ratio ofnon-thermal to thermal electron pressure within Triangulum Australis to be$X=0.658\pm0.054$. We use this ratio to constrain the maximum magnetic fieldstrength within the halo region to be $B_{\rm max, halo} = 33.08\,\mu$G andcompare this with the minimum field strength from equipartition of $B_{\rm min,halo} = 0.77(1+k)^{2/7}\,\mu$G to place limits on the range of allowed magneticfield strength within this cluster. We compare these values to those for morewell-studied systems and discuss these results in the context of equipartitionof non-thermal energy densities within clusters of galaxies.

KAT-7 detection of radio halo emission in the Triangulum Australis galaxy cluster