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

Anna M M Scaife, Nadeem Oozeer, Francesco de Gasperin, Marcus Brüggen, Cyril Tasse, Lindsay Magnus

    Research output: Contribution to journalArticlepeer-review


    We 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 galaxies.
    Original languageEnglish
    Pages (from-to)4021-4028
    Number of pages8
    JournalMonthly Notices of the Royal Astronomical Society
    Publication statusPublished - 2015


    • galaxies: clusters: individual: Triangulum Australis
    • galaxies: clusters: intracluster medium


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