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

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Scaife, Anna M.M.
Oozeer, Nadeem
De Gasperin, Francesco
Brüggen, Marcus
Tasse, Cyril

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Oxford University Press

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

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Scaife, 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]

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