Measuring turbulence and gas motions in galaxy clusters via synthetic Athena X-IFU observations M. Roncarelli, M. Gaspari, S. Ettori, V. Biffi, F. Brighenti, E. Bulbul, N. Clerc, E. Cucchetti, E. Pointecouteau and E. Rasia A&A, 618 (2018) A39 Published online: 15 October 2018 DOI: 10.1051/0004-6361/201833371