Highly ionized region surrounding SN Refsdal revealed by MUSE W. Karman, C. Grillo, I. Balestra, P. Rosati, K. I. Caputi, E. Di Teodoro, F. Fraternali, R. Gavazzi, A. Mercurio, J. X. Prochaska et al. (2 more) A&A, 585 (2016) A27 Published online: 10 December 2015 DOI: 10.1051/0004-6361/201527443