D. Horns (1), A.I.D. Hoffmann (1), A. Santangelo (1), F.A. Aharonian (2), G.P. Rowell (3) ((1) Institute for Astronomy and Astrophysics, University of Tübingen, Germany (2) Max-Planck-Institute for Nuclear Physics, Heidelberg, Germany (3) School of Chemistry and Physics, University of Adelaide, Australia)
