Euclid preparation. Testing analytic models of galaxy intrinsic alignments in the Euclid Flagship simulation

HAL 2026

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Authors: Romain Paviot, Benjamin Joachimi, K. Hoffmann, Sandrine Codis, Isaac Tutusaus, D Navarro-Gironés, J Blazek, Fabian Hervas Peters, B. Altieri, Stefano Andreon, N. Auricchio, C. Baccigalupi
+88 more M. Baldi, S. Bardelli, A. Biviano, E. Branchini, M. Brescia, S. Camera, G. Cañas-Herrera, V. Capobianco, C. Carbone, V. F. Cardone, J. Carretero, Santiago Casas, F. Castander, M. Castellano, G. Castignani, S. Cavuoti, K. C. Chambers, G. Congedo, C Colodro-Conde, G. Congedo, L. Conversi, Y. Copin, F. Courbin, Hélène M. Courtois, A da Silva, Hubert Degaudenzi, S. de la Torre, G. De Lucia, Herve A. Dole, F. Dubath, C. A. J. Duncan, Xavier Dupac, S. Dusini, S. Escoffier, Maria Farina, R. Farinelli, S. Farrens, S Ferriol, Fabio Finelli, P. Fosalba, M. Frailis, Enrico Franceschi, Samuele Galeotta, K. George, Bryan R. Gillis, C. Giocoli, J. Gracia-Carpio, A. Grazian, Frank U. Grupp, S.V.H Haugan, Henk Hoekstra, W. Holmes, F. Hormuth, A. Hornstrup, K. Jahnkę, M. Jhabvala, Elina Keihänen, Smaïn Kermiche, A. Kiessling, M. Kilbinger, Bogna Kubik, M Kümmel, Martin Kunz, Hannu Kurki-Suonio, Amandine M. C. Le Brun, S. Ligori, Per Barth Lilje, V. Lindholm, Ivan Lloro, Gabriele Mainetti, Davide Maino, E. Maiorano, O. Mansutti, S. Marcin, O. Marggraf, M. Martinelli, N. Martinet, F. Marulli, Richard James Massey, S. Maurogordato, Eduardo Medinaceli, S. Mei, Y. Mellier, Massimo Meneghetti, E. Merlin, G. Meylan, A. Mora, M. Moresco
DOI: 10.1051/0004-6361/202658933
Cited by: 0

Abstract

We model intrinsic alignments (IA) in Euclid's Flagship simulation to investigate its impact on Euclid's weak lensing signal. Our IA implementation in the Flagship simulation takes into account photometric properties of galaxies as well as their dark matter host halos. We compare simulations against theory predictions, determining the parameters of two of the most widely used IA models: the Non Linear Alignment (NLA) and the Tidal Alignment and Tidal Torquing (TATT) models. We measure the amplitude of the simulated IA signal as a function of galaxy magnitude and colour in the redshift range $0.1

Fields of Study & Subjects

Cosmology and Gravitation Theories Galaxies: Formation Evolution Phenomena Stellar planetary and galactic studies

Publication details

Journal / source
HAL
Volume
713
Pages
A258
Publication date
1 January 2026
Language
EN