Observing gravitational redshift with X-ray emission in galaxy clusters with Athena X-IFU A. Molin, N. Clerc, E. Pointecouteau, F. Pajot and E. Cucchetti A&A, 679 (2023) A24 Published online: 30 October 2023 DOI: 10.1051/0004-6361/202347269