Evidence of a pure starburst nature of the nuclear region of NGC 253 A. Brunthaler, P. Castangia, A. Tarchi, C. Henkel, M. J. Reid, H. Falcke and K. M. Menten A&A, 497 1 (2009) 103-108 Published online: 09 February 2009 DOI: 10.1051/0004-6361/200911615