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

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    Date
    2015
    Author
    Scaife, Anna M.M.
    Oozeer, Nadeem
    De Gasperin, Francesco
    Brüggen, Marcus
    Tasse, Cyril
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    Abstract
    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
    URI
    http://hdl.handle.net/10394/18420
    http://dx.doi.org/10.1093/mnras/stv911
    http://mnras.oxfordjournals.org/content/451/4/4021.full.pdf+html
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