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Mora, A. Navarro-Alsina, A. N. Taylor, A. Pezzotta, A. Pisani, A. R. Cooray, A. Renzi, A. Schneider, A. Secroun, A. Troja, A. Venhola, A. Veropalumbo, A. Viitanen, A. Zacchei, B. Altieri, B. Gillis, B. Kubik, B. Laloux, B. R. Granett, B. Sartoris, C. A. J. Duncan, C. Baccigalupi, C. Benoist, C. Burigana, C. Carbone, C. C. Kirkpatrick, C. Colodro-Conde, C. Dolding, C. Giocoli, C. Hern\\'andez-Monteagudo, C. J. A. P. Martins, C. J. Conselice, C. M. Gutierrez, C. Moretti, C. Neissner, C. Padilla, C. Porciani, C. S. Carvalho, C. Sirignano, C. Valieri, D. Bertacca, D. B. Sanders, D. C. Masters, D. Di Ferdinando, D. Karagiannis, D. Le Mignant, D. Maino, D. Potter, D. Sapone, D. Sciotti, D. Scott, D. Tavagnacco, D. Vergani, E. Bozzo, E. Branchini, E. Franceschi, E. Gaztanaga, E. Keih\\\"anen, E. Lusso, E. Maiorano, E. Medinaceli, E. Merlin, E. Romelli, E. Sarpa, E. Sellentin, E. Soubrie, Euclid Collaboration: W. Roster, E. Zucca, F. Atrio-Barandela, F. Caro, F. Cogato, F. Courbin, F. 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Sakr","submitted_at":"2025-03-19T15:27:11Z","abstract_excerpt":"To better understand the role of active galactic nuclei (AGN) in galaxy evolution, it is crucial to achieve a complete and pure AGN census. X-ray surveys are key to this, but identifying their counterparts (CTPs) at other wavelengths remains challenging due to their larger positional uncertainties and limited availability of deeper, uniform ancillary data. Euclid is revolutionising this effort, offering extensive coverage of nearly the entire extragalactic sky, particularly in the near-infrared bands, where AGN are more easily detected. 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