A wide-field H I mosaic of Messier 31 - II. The disk warp, rotation, and the dark matter halo E. Corbelli, S. Lorenzoni, R. Walterbos, R. Braun and D. Thilker A&A, 511 (2010) A89 Published online: 17 March 2010 DOI: 10.1051/0004-6361/200913297