1. Theoretical Physics IV, Faculty for Physics & Astronomy, Ruhr University Bochum , D-44780 Bochum , Germany
2. Faculty for Physics & Astronomy, Astronomical Institute, Ruhr University Bochum , D-44780 Bochum , Germany
3. Ruhr Astroparticle and Plasma Physics Center, Ruhr-Universität Bochum , D-44780 Bochum , Germany
4. Konkoly Observatory, HUN-REN Research Centre for Astronomy and Earth Sciences , Konkoly Thege Miklós út 15-17, H-1121 Budapest , Hungary
5. CSFK, MTA Centre of Excellence , Konkoly Thege Miklós út 15-17, H-1121 Budapest , Hungary
6. Max-Planck-Institute für Radioastronomie , Auf dem Hügel 69, D-53121 Bonn , Germany
7. Institute of Physics and Astronomy, ELTE Eötvös Loránd University , Pázmány Péter sétány 1/A, H-1117 Budapest , Hungary
8. Department of Astronomy, Institute of Physics and Astronomy, ELTE Eötvös Loránd University , Pázmány Péter sétány 1/A, H-1117 Budapest , Hungary
9. HUN-REN–ELTE Extragalactic Astrophysics Research Group , Pázmány Péter sétány 1/A, H-1117 Budapest , Hungary
10. Department of Experimental Physics, University of Szeged , Dóm tér 9, H-6720 Szeged , Hungary
11. Department of Theoretical Physics, University of Szeged , Tisza Lajos krt. 84-86, H-6720 Szeged , Hungary
12. Department of Theoretical Physics, HUN-REN Wigner Research Centre for Physics , Konkoly-Thege Miklós út 29-33, H-1121 Budapest , Hungary