Fossil group origins III. The relation between optical and X-ray luminosities

M. Girardi^*, J. A. L. Aguerri, S. De Grandi, E. D'Onghia, R. Barrena, W. Boschin, Jairo Mendez Abreu, R. Sanchez-Janssen, S. Zarattini, A. Biviano, N. Castro-Rodriguez, E. M. Corsini, C. del Burgo, J. Iglesias-Paramo, J. M. Vilchez

^*Corresponding author for this work