IXPE observation confirms a high spin in the accreting black hole 4U 1957+115 L. Marra, M. Brigitte, N. Rodriguez Cavero, S. Chun, J. F. Steiner, M. Dovčiak, M. Nowak, S. Bianchi, F. Capitanio, A. Ingram et al. (106 more) A&A, 684 (2024) A95 Published online: 08 April 2024 DOI: 10.1051/0004-6361/202348277