Euclid preparation
Year: 2026
Type: article
Abstract: We model intrinsic alignment (IA) in Euclid ’s Flagship simulation to investigate its impact on Euclid ’s weak lensing signal. Our IA implementation in the Flagship simulation takes the photometric properties of galaxies into account, along with their dark matter host halos. The simulation parameters are calibrated using combined constraints from observations and cosmological hydrodynamical simulations. We compare simulations against theory predictions, determining the parameters of two of the most widely used IA models: the nonlinear alignment (NLA) and the tidal alignment and tidal torquing (TATT) models. We measured the amplitude of the simulated IA signal as a function of galaxy magnitude and colour in the redshift range 0.1 < z < 2.1, close that of Euclid ’s main galaxy sample. We find that both NLA and TATT are able to accurately describe the IA signal in the simulation down to scales of 6–7 h −1 Mpc. We measured the alignment amplitudes for red galaxies that are comparable to those of the observations, using samples that had not been used in the initial calibration procedure. For blue galaxies, our constraints are consistent with zero alignments in our first redshift bin 0.1 < z < 0.3, but we detected a non-negligible signal at higher redshift; however, this signal is consistent with the upper limits set by observational constraints. Additionally, several hydrodynamical simulations have predicted alignments for spiral galaxies, in agreement with our findings. Finally, the evolution of alignment with redshift is realistic and comparable to what has been determined based on observations. However, we find that the commonly adopted redshift power law for IA fails to reproduce the simulation alignments above z = 1.1. A significantly improved agreement can be obtained when the luminosity dependence is included, capturing the intrinsic luminosity evolution with redshift in magnitude-limited surveys. We conclude that the Flagship IA simulation is a useful tool for translating current IA constraints into predictions for IA contamination of Euclid -like samples.
Source: Astronomy and Astrophysics
Authors: R. Paviot, B. Joachimi, K. Hoffmann, S. Codis, I. Tutusaus, D. Navarro-Gironés, J. Blazek, F. Hervas-Peters, B. Altieri, S. Andreon, N. Auricchio, C. Baccigalupi, M. Baldi, S. Bardelli, A. Biviano, E. Branchini, M. Brescia, S. Camera, G. Cañas-Herrera, V. Capobianco, C. Carbone, V. F. Cardone, J. Carretero, S. Casas, F. J. Castander, M. Castellano, G. Castignani, S. Cavuoti, K. C. Chambers, A. Cimatti, C. Colodro-Conde, G. Congedo, L. Conversi, Y. Copin, F. Courbin, H. M. Courtois, A. Da Silva, H. Degaudenzi, S. de la Torre, G. De Lucia, H. Dole, F. Dubath, C. A. J. Duncan, X. Dupac, S. Dusini, S. Escoffier, M. Farina, R. Farinelli, S. Farrens, S. Ferriol, F. Finelli, P. Fosalba, M. Frailis, E. Franceschi, S. Galeotta, K. George, B. Gillis, C. Giocoli, J. Gracia-Carpio, A. Grazian, F. Grupp, S. V. H. Haugan, H. Hoekstra, W. Holmes, F. Hormuth, A. Hornstrup, K. Jahnke, M. Jhabvala, E. Keihänen, S. Kermiche, A. Kiessling, M. Kilbinger, B. Kubik, M. Kümmel, M. Kunz, H. Kurki-Suonio, A. M. C. Le Brun, S. Ligori, P. B. Lilje, V. Lindholm, I. Lloro, G. Mainetti, D. Maino, E. Maiorano, O. Mansutti, S. Marcin, O. Marggraf, M. Martinelli, N. Martinet, F. Marulli, R. J. Massey, S. Maurogordato, E. Medinaceli, S. Mei, Y. Mellier, M. Meneghetti, E. Merlin, G. Meylan, A. Mora, M. Moresco, L. Moscardini, C. Neissner, S.-M. Niemi, C. Padilla, S. Paltani, F. Pasian, K. Pedersen, V. Pettorino, S. Pires, G. Polenta, M. Poncet, L. A. Popa, L. Pozzetti, F. Raison, R. Rebolo, A. Renzi, J. Rhodes, G. Riccio, E. Romelli, M. Roncarelli, R. Saglia, Z. Sakr, A. G. Sánchez, D. Sapone, B. Sartoris, P. Schneider, T. Schrabback, A. Secroun, E. Sefusatti, G. Seidel, S. Serrano, P. Simon, C. Sirignano, G. Sirri, A. Spurio Mancini, L. Stanco, J. Steinwagner, P. Tallada-Crespí, A. N. Taylor, I. Tereno, N. Tessore, S. Toft, R. Toledo-Moreo, F. Torradeflot, L. Valenziano, J. Valiviita, T. Vassallo, G. Verdoes Kleijn, A. Veropalumbo, Y. Wang, J. Weller, A. Zacchei, G. Zamorani, F. M. Zerbi, E. Zucca, E. Bozzo, C. Burigana, R. Cabanac, M. Calabrese, J. A. Escartin Vigo, L. Gabarra, W. G. Hartley, S. Matthew, M. Maturi, N. Mauri, R. B. Metcalf, A. Pezzotta, M. Pöntinen, C. Porciani, I. Risso, V. Scottez, M. Sereno, M. Tenti, M. Viel, M. Wiesmann, Y. Akrami, I. T. Andika, S. Anselmi, M. Archidiacono, F. Atrio-Barandela, D. Bertacca, M. Bethermin, A. Blanchard, L. Blot, H. Böhringer, M. Bonici, S. Borgani, M. L. Brown, S. Bruton, A. Calabro, B. Camacho Quevedo, F. Caro, C. S. Carvalho, T. Castro, F. Cogato, S. Conseil, A. R. Cooray, O. Cucciati, S. Davini, F. De Paolis, G. Desprez, A. Díaz-Sánchez, J. J. Diaz, S. Di Domizio, J. M. Diego, P. Dimauro, M. Y. Elkhashab, A. Enia, Y. Fang, A. G. Ferrari, A. Finoguenov, A. Fontana, A. Franco, K. Ganga, J. García-Bellido, T. Gasparetto, V. Gautard, R. Gavazzi, E. Gaztanaga, F. Giacomini, F. Gianotti, G. Gozaliasl, M. Guidi, C. M. Gutierrez, A. Hall, S. Hemmati, H. Hildebrandt, J. Hjorth, S. Joudaki, J. J. E. Kajava, Y. Kang, V. Kansal, D. Karagiannis, K. Kiiveri, J. Kim, C. C. Kirkpatrick, S. Kruk, J. Le Graet, L. Legrand, M. Lembo, F. Lepori, G. Leroy, G. F. Lesci, J. Lesgourgues, T. I. Liaudat, A. Loureiro, J. Macias-Perez, G. Maggio, M. Magliocchetti, F. Mannucci, R. Maoli, C. J. A. P. Martins, L. Maurin, M. Miluzio, P. Monaco, C. Moretti, G. Morgante, S. Nadathur, K. Naidoo, P. Natoli, A. Navarro-Alsina, S. Nesseris, L. Pagano, D. Paoletti, F. Passalacqua, K. Paterson, L. Patrizii, A. Pisani, D. Potter, S. Quai, M. Radovich, S. Sacquegna, M. Sahlén, D. B. Sanders, E. Sarpa, A. Schneider, M. Schultheis, D. Sciotti, E. Sellentin, L. C. Smith, J. G. Sorce, K. Tanidis, C. Tao, G. Testera, R. Teyssier, S. Tosi, A. Troja, M. Tucci, C. Valieri, A. Venhola, D. Vergani, F. Vernizzi, G. Verza, P. Vielzeuf, N. A. Walton
Institutions: Centre National de la Recherche Scientifique, Université Paris Cité, Commissariat à l'Énergie Atomique et aux Énergies Alternatives, Université Paris-Saclay, Centre National d'Études Spatiales, Astrophysique, Instrumentation et Modélisation, University College London, Institute of Space Sciences, Université Toulouse III - Paul Sabatier, Institut d'Estudis Espacials de Catalunya, Institut de Recherche en Astrophysique et Planétologie, Université de Toulouse, Universitat Politècnica de Catalunya, Leiden University, Leiden Observatory, Northeastern University, University of Zurich, European Space Agency, European Space Astronomy Centre, Brera Astronomical Observatory, National Institute for Astrophysics, Osservatorio di Astrofisica e Scienza dello Spazio, Scuola Internazionale Superiore di Studi Avanzati, Trieste Astronomical Observatory, Istituto Nazionale di Fisica Nucleare, Sezione di Trieste, Institute for Fundamental Physics of the Universe, Istituto Nazionale di Fisica Nucleare, Sezione di Bologna, University of Bologna, Istituto Nazionale di Fisica Nucleare, Sezione di Genova, University of Genoa, Astronomical Observatory of Capodimonte, University of Naples Federico II, Istituto Nazionale di Fisica Nucleare, Sezione di Torino, Osservatorio Astrofisico di Torino, University of Turin, European Space Research and Technology Centre, Astronomical Observatory of Rome, Istituto Nazionale di Fisica Nucleare, Sezione di Roma I, Universitat Autònoma de Barcelona, Port d'Informació Científica, Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas, RWTH Aachen University, Istituto Nazionale di Fisica Nucleare, Istituto Nazionale di Fisica Nucleare, Sezione di Napoli, University of Hawaiʻi at Mānoa, University of Hawaii System, Instituto de Astrofísica de Canarias, Royal Observatory, University of Edinburgh, European Space Research Institute, Lyon 1 Université, Institut National de Physique Nucléaire et de Physique des Particules, Institut de Physique des 2 Infinis de Lyon, Institució Catalana de Recerca i Estudis Avançats, Institut de Ciències del Cosmos, Universitat de Barcelona, University of Lisbon, Institute of Astrophysics and Space Sciences, University of Geneva, Aix-Marseille Université, Institut d'Astrophysique Spatiale, University of Manchester, Istituto Nazionale di Fisica Nucleare, Sezione di Padova, Centre de physique des particules de Marseille, Institute for Space Astrophysics and Planetology, Ludwig-Maximilians-Universität München, Max Planck Institute for Extraterrestrial Physics, Osservatorio Astronomico di Padova, University of Oslo, Jet Propulsion Laboratory, Technical University of Denmark, Max Planck Institute for Astronomy, Goddard Space Flight Center, Helsinki Institute of Physics, Université Paris Sciences et Lettres, Observatoire de Paris, Sorbonne Université, Laboratoire d'Étude de l'Univers et des Phénomènes Extrêmes, SKA Observatory, Centre de Calcul de l’Institut National de Physique Nucléaire et de Physique des Particules, University of Milan, Istituto Nazionale di Fisica Nucleare, Sezione di Milano, FHNW University of Applied Sciences and Arts Northwestern Switzerland, University of Bonn, Durham University, Université Côte d'Azur, Lagrange Laboratory, Observatoire de la Côte d’Azur, Centre Pierre Binétruy, Institut d'Astrophysique de Paris, École Polytechnique Fédérale de Lausanne, Institute for High Energy Physics, Barcelona Institute of Science and Technology, University of Copenhagen, Agenzia Spaziale Italiana, Consejo Superior de Investigaciones Científicas, Universidad de La Laguna, University of Padua, Saint Joseph University, Heidelberg University, University of Chile, Universität Innsbruck, Bodø Science Park (Norway), University of London, Royal Holloway University of London, Universidad Politécnica de Cartagena, University of Groningen, California Institute of Technology, Infrared Processing and Analysis Center, Istituto di Radioastronomia di Bologna, Osservatorio Astronomico della Regione Autonoma Valle d'Aosta, Regione Autonoma Valle d'Aosta, University of Oxford, Université Catholique de Lille, Fondazione ICSC Centro Nazionale di Ricerca in High Performance Computing, Big Data e Quantum Computing, Instituto de Física Teórica, Case Western Reserve University, Max Planck Institute for Astrophysics, Technical University of Munich, Laboratoire Univers et Théories, Universidad de Salamanca, Observatoire astronomique de Strasbourg, Université de Strasbourg, Kavli Institute for the Physics and Mathematics of the Universe, The University of Tokyo, Max Planck Institute for Physics, University of Waterloo, University of Trieste, University of California, Irvine, University of Salento, Istituto Nazionale di Fisica Nucleare, Sezione di Lecce, Instituto de Física de Cantabria, National Observatory, CEA Paris-Saclay - Etablissement de Saclay, Institut de Recherche sur les Lois Fondamentales de l'Univers, University of Portsmouth, Aalto University, Ruhr University Bochum, University of Turku, ARC Centre of Excellence for Dark Matter Particle Physics, Swinburne University of Technology, University of Ferrara, University of the Western Cape, University of Cambridge, Stockholm University, Imperial College London, Institut polytechnique de Grenoble, Arcetri Astrophysical Observatory, Sapienza University of Rome, Universidade do Porto, Centro de Astrofísica da Universidade do Porto, Istituto Nazionale di Fisica Nucleare, Sezione di Ferrara, Collurania Teramo Observatory, Uppsala University, Université de Lille, Centre de Recherche en Informatique, Signal et Automatique de Lille, Centrale Lille Institut, Princeton University, University of Oulu, Institut de Physique Théorique, Flatiron Institute
Language: English
Subfield: Astronomy and Astrophysics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: gold
Estimated APC paid: $1,865
OpenAlex ID: W7123903345