Coevolution of halo and quasar properties in dense environments: CARLA J1017+6116 at z = 2.8 Sofia G. Gallego, Simona Mei, Christopher Martin, Donal O’Sullivan, Emanuele Daddi, Dominika Wylezalek and Nicholas Seymour A&A, 698 (2025) A243 Published online: 17 June 2025 DOI: 10.1051/0004-6361/202553857