Water megamaser emission in hard X-ray selected AGN F. Panessa, P. Castangia, A. Malizia, L. Bassani, A. Tarchi, A. Bazzano and P. Ubertini A&A, 641 (2020) A162 Published online: 24 September 2020 DOI: 10.1051/0004-6361/201937407