Modelling the black hole silhouette in Sagittarius A* with ion tori O. Straub, F. H. Vincent, M. A. Abramowicz, E. Gourgoulhon and T. Paumard A&A, 543 (2012) A83 Published online: 03 July 2012 DOI: 10.1051/0004-6361/201219209