[1] European Southern Observatory (ESO), Karl-Schwarzschild-Straße 2, Garching bei München,85748, Germany
[2] German Aerospace Center (DLR), Institute of Communications and Navigation, Wessling, Germany
[3] Centre for Extragalactic Astronomy, Department of Physics, Durham University, Durham,DH1 3LE, United Kingdom
[4] School of Mathematics, Statistics and Physics, Newcastle University, Newcastle upon Tyne,NE1 7RU, United Kingdom
[5] Institute for Astronomy, University of Edinburgh, Royal Observatory, Blackford Hill, Edinburgh,EH9 3HJ, United Kingdom
[6] Centre for Astrophysics Research, University of Hertfordshire, College Lane, Hatfield,AL10 9AB, United Kingdom
[7] Leiden Observatory, Leiden University, PO Box 9513, Leiden,2300 RA, Netherlands
[8] INAF – Istituto di Radioastronomia, Via P. Gobetti 101, Bologna,40129, Italy
[9] SKA Observatory, Jodrell Bank, Lower Withington, Macclesfield,SK11 9FT, United Kingdom
[10] CSIRO Space and Astronomy, ATNF, PO Box 1130, Bentley,WA,6102, Australia
[11] Institute for Computational Cosmology, Department of Physics, University of Durham, South Road, Durham,DH1 3LE, United Kingdom