tokens: We thank Laura Bonavera for assisting with the C2499 ATCA observations of this project. We wish also to thank Mark Wieringa for the support on the miriad data reduction and Piero Ullio for insightful discussions during the early stages of the project. SC acknowledges support by the South African Research Chairs Initiative of the Department of Science and Technology and National Research Foundation and by the Square Kilometre Array (SKA). SP is partly supported by the US Department of Energy, Contract DE-FG02-04ER41268. MR acknowledges support by the research grant TAsP ( Theoretical Astroparticle Physics ) funded by the Istituto Nazionale di Fisica Nucleare (INFN). The ATCA is part of the Australia Telescope National Facility which is funded by the Commonwealth of Australia for operation as a National Facility managed by CSIRO.
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