1. School of Mathematics, Statistics and Physics, Newcastle University , Newcastle NE1 7RU , UK
2. Ludwig-Maximilians-Universität , Professor-Huber-Platz 2, D-80539 München , Germany
3. European Southern Observatory , Karl–Schwarzschild–Straße 2, D-85748 Garching bei München , Germany
4. Department of Physics, University of Crete , 70013 Heraklion , Greece
5. Institute of Astrophysics, Foundation for Research and Technology , Hellas, Voutes, 70013 Heraklion , Greece
6. Centre for Extragalactic Astronomy, Department of Physics, Durham University , South Road, Durham DH1 3LE , UK
7. Max Planck Institut für Astrophysik , Karl–Schwarzschild–Straße 1, D-85748 Garching bei München , Germany
8. Departamento de Física, CCNE, Universidade Federal de Santa Maria , 97105-900 Santa Maria, RS , Brazil
9. Department of Physics and Astronomy, University of California , 4129 Frederick Reines Hall, Irvine, CA 92697 , USA
10. European Space Agency (ESA), European Space Astronomy Centre (ESAC) , Camino bajo del Castillo s/n, Villanueva de la Cañada, E-28692 Madrid , Spain
11. Department of Physics & Astronomy, University College London , Gower Street, London WC1E 6BT , UK
12. Gemini Observatory, NSF’s NOIRLab , 670 N A’ohoku Place, Hilo, HI 96720 , USA
13. Space Telescope Science Institute , 3700 San Martin Drive, Baltimore, MD 21218 , USA
14. National Centre for Radio Astrophysics – Tata Institute of Fundamental Research , Pune University Campus, Post Bag 3, Ganeshkhind, Pune 411007 , India
15. Astrophysics Research Institute, Liverpool John Moores University , 146 Brownlow Hill, Liverpool L3 5RF , UK
16. Inter-University Centre for Astronomy and Astrophysics , Post Bag 4, Pune 411007 , India
17. Departamento de Astronomía, Universidad de Concepción , Concepción 4070386 , Chile
18. Scuola Normale Superiore , Piazza dei Cavalieri 7, I-56126 Pisa , Italy
19. INAF - Osservatorio Astrofisico di Arcetri , Largo E. Fermi 5, I-50125 Firenze , Italy