Euclid preparation
Year: 2026
Type: article
Abstract: Aims. In this paper we present cosmological parameter forecasts for the Euclid 6 × 2 pt statistics, which include the galaxy clustering and weak lensing main probes together with previously neglected cross-covariance and cross-correlation signals between imaging-photometric and spectroscopic data. The aim is understanding the impact of such cross-terms on the expected Euclid performance. Methods. We adopted the Fisher information matrix approach to produce 6 × 2 pt cosmological forecasts from Euclid , considering two different techniques known as the harmonic and hybrid approaches, respectively. In the first, we treat all the different Euclid probes in the same way, i.e., we consider only angular 2 pt statistics for spectroscopic and photometric galaxy distributions, as well as for weak lensing, fully analyzing all their possible cross-covariances and cross-correlations in the spherical harmonic domain. In the second, thanks to lessons learned from the harmonic approach, we do not account for negligible cross-covariances between the 3D spectroscopic galaxy distribution and the 2D photometric/imaging data, but consider the combination of their cross-correlation with the autocorrelation signals. Results. We find that both cross-covariance and cross-correlation signals between the two Euclid main probes, i.e., the spectroscopic galaxy sample and the photometric-imaging data, have a negligible impact on the cosmological parameter constraints and therefore on the Euclid performance. In the case of the hybrid approach, we attribute this result to the effect of the cross-correlation between weak lensing and photometric data, which is dominant with respect to other cross-correlation signals, and to the better performance of the full anisotropic 3D spectroscopic galaxy clustering with respect to the projected clustering. In the case of the 2D harmonic approach, we attribute this result to two main theoretical limitations of the 2D projected statistics implemented in this work according to the analysis of the official Euclid forecasts: the high shot noise and the limited redshift range of the spectroscopic sample, with respect to the photometric sample, together with the suppression of radial information from subdominant contributions such as redshift-space distortions and lensing magnification. Therefore, our analysis suggests that 2D and 3D Euclid data can be safely treated as independent, with a great saving in computational resources.
Source: Astronomy and Astrophysics
Authors: L. Paganin, M. Bonici, C. Carbone, S. Camera, I. Tutusaus, S. Davini, J. Bel, S. Tosi, D. Sciotti, S. Di Domizio, I. Risso, G. Testera, D. Sapone, Z. Sakr, A. Amara, S. Andreon, N. Auricchio, C. Baccigalupi, M. Baldi, S. Bardelli, P. Battaglia, R. Bender, F. Bernardeau, A. Biviano, C. Bodendorf, D. Bonino, E. Branchini, M. Brescia, J. Brinchmann, V. Capobianco, V. F. Cardone, J. Carretero, S. Casas, M. Castellano, G. Castignani, S. Cavuoti, G. Cañas-Herrera, K. C. Chambers, A. Cimatti, C. Colodro-Conde, G. Congedo, C. J. Conselice, L. Conversi, Y. Copin, L. Corcione, A. Costille, F. Courbin, H. M. Courtois, M. Crocce, M. Cropper, A. Da Silva, H. Degaudenzi, G. De Lucia, A. M. Di Giorgio, J. Dinis, H. Dole, F. Dubath, C. A. J. Duncan, X. Dupac, S. Dusini, A. Ealet, S. Escoffier, M. Farina, R. Farinelli, S. Farrens, S. Ferriol, F. Finelli, M. Frailis, E. Franceschi, S. Galeotta, B. Garilli, K. George, W. Gillard, B. Gillis, C. Giocoli, J. Graciá-Carpio, A. Grazian, F. Grupp, L. Guzzo, S. V. H. Haugan, W. Holmes, I. Hook, F. Hormuth, A. Hornstrup, S. Ilić, K. Jahnke, B. Joachimi, E. Keihänen, S. Kermiche, A. Kiessling, M. Kilbinger, T. Kitching, B. Kubik, M. Kümmel, M. Kunz, H. Kurki-Suonio, S. Ligori, P. B. Lilje, V. Lindholm, I. Lloro, G. Mainetti, D. Maino, E. Maiorano, O. Mansutti, O. Marggraf, K. Markovic, M. Martinelli, N. Martinet, F. Marulli, R. Massey, H. J. McCracken, E. Medinaceli, S. Mei, Y. Mellier, M. Meneghetti, E. Merlin, G. Meylan, M. Moresco, L. Moscardini, E. Munari, S.-M. Niemi, J. W. Nightingale, C. Padilla, S. Paltani, F. Pasian, K. Pedersen, W. J. Percival, 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, E. Rossetti, R. Saglia, B. Sartoris, P. Schneider, T. Schrabback, M. Scodeggio, A. Secroun, G. Seidel, S. Serrano, C. Sirignano, G. Sirri, L. Stanco, J.-L. Starck, J. Steinwagner, C. Surace, P. Tallada-Crespí, D. Tavagnacco, A. N. Taylor, I. Tereno, N. Tessore, S. Toft, R. Toledo-Moreo, F. Torradeflot, E. A. Valentijn, L. Valenziano, J. Valiviita, T. Vassallo, A. Veropalumbo, Y. Wang, J. Weller, A. Zacchei, G. Zamorani, J. Zoubian, E. Zucca, A. Boucaud, E. Bozzo, C. Burigana, M. Calabrese, D. Di Ferdinando, G. Fabbian, N. Mauri, V. Scottez, M. Tenti, M. Viel, M. Wiesmann, Y. Akrami, V. Allevato, S. Anselmi, M. Ballardini, A. Blanchard, S. Borgani, S. Bruton, R. Cabanac, A. Calabro, A. Cappi, C. S. Carvalho, T. Castro, S. Contarini, A. R. Cooray, J. Coupon, G. Desprez, A. Díaz-Sánchez, J. A. Escartin Vigo, P. G. Ferreira, I. Ferrero, F. Fornari, L. Gabarra, K. Ganga, J. García-Bellido, E. Gaztanaga, F. Giacomini, G. Gozaliasl, A. Gregorio, A. Hall, H. Hildebrandt, J. Hjorth, J. J. E. Kajava, V. Kansal, D. Karagiannis, C. C. Kirkpatrick, L. Legrand, A. Loureiro, J. Macias-Perez, G. Maggio, M. Magliocchetti, F. Mannucci, R. Maoli, C. J. A. P. Martins, S. Matthew, L. Maurin, R. B. Metcalf, M. Migliaccio, P. Monaco, G. Morgante, S. Nadathur, L. Patrizii, A. Pezzotta, V. Popa, C. Porciani, D. Potter, M. Pöntinen, P.-F. Rocci, M. Sahlén, A. Schneider, M. Schultheis, M. Sereno, C. Tao, R. Teyssier, A. Troja, M. Tucci, C. Valieri, D. Vergani, G. Verza, P. Vielzeuf
Institutions: Istituto Nazionale di Fisica Nucleare, Sezione di Genova, University of Genoa, National Institute for Astrophysics, Istituto Nazionale di Fisica Nucleare, Sezione di Torino, Osservatorio Astrofisico di Torino, University of Turin, University of Geneva, Centre National de la Recherche Scientifique, 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, Université de Toulon, Aix-Marseille Université, Centre de Physique Théorique, Brera Astronomical Observatory, Astronomical Observatory of Rome, Istituto Nazionale di Fisica Nucleare, Sezione di Roma I, Sapienza University of Rome, University of Chile, Saint Joseph University, Heidelberg University, University of Surrey, 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, Max Planck Institute for Extraterrestrial Physics, Ludwig-Maximilians-Universität München, Commissariat à l'Énergie Atomique et aux Énergies Alternatives, Université Paris-Saclay, Institut d'Astrophysique de Paris, Sorbonne Université, Institut de Physique Théorique, Istituto Nazionale di Fisica Nucleare, Astronomical Observatory of Capodimonte, Istituto Nazionale di Fisica Nucleare, Sezione di Napoli, University of Naples Federico II, Universidade do Porto, Institute of Astrophysics and Space Sciences, Centro de Astrofísica da Universidade do Porto, Universitat Autònoma de Barcelona, Institute for High Energy Physics, Barcelona Institute of Science and Technology, Port d'Informació Científica, RWTH Aachen University, Leiden University, European Space Agency, European Space Research and Technology Centre, University of Hawaiʻi at Mānoa, University of Hawaii System, Instituto de Astrofísica de Canarias, Royal Observatory, University of Edinburgh, University of Manchester, European Space Astronomy Centre, 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, École Polytechnique Fédérale de Lausanne, Consejo Superior de Investigaciones Científicas, University College London, University of Lisbon, Institute for Space Astrophysics and Planetology, Institut d'Astrophysique Spatiale, University of Oxford, Istituto Nazionale di Fisica Nucleare, Sezione di Padova, Centre de physique des particules de Marseille, Université Paris Cité, Astrophysique, Instrumentation et Modélisation, Osservatorio Astronomico di Padova, University of Milan, Istituto Nazionale di Fisica Nucleare, Sezione di Milano, University of Oslo, Jet Propulsion Laboratory, Lancaster University, von Hoerner & Sulger (Germany), Technical University of Denmark, Centre National d'Études Spatiales, Laboratoire de Physique des 2 Infinis Irène Joliot-Curie, Max Planck Institute for Astronomy, University of Helsinki, Helsinki Institute of Physics, Netherlands Institute for Radio Astronomy, Centre de Calcul de l’Institut National de Physique Nucléaire et de Physique des Particules, University of Bonn, Durham University, Newcastle University, Aarhus University, University of Waterloo, Perimeter Institute, Agenzia Spaziale Italiana, Universidad de La Laguna, University of Padua, Universität Innsbruck, Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas, University of Copenhagen, 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, Flatiron Institute, Cardiff University, 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, Université Paris Sciences et Lettres, Observatoire de Paris, Laboratoire Univers et Théories, University of Ferrara, Istituto Nazionale di Fisica Nucleare, Sezione di Ferrara, University of Trieste, University of Minnesota, Université Côte d'Azur, Lagrange Laboratory, Observatoire de la Côte d’Azur, University of California, Irvine, Saint Mary's University, University of Portsmouth, Aalto University, Ruhr University Bochum, University of Turku, W.M. Keck Observatory, ARC Centre of Excellence for Dark Matter Particle Physics, Swinburne University of Technology, Queen Mary University of London, University of the Western Cape, ICTP South American Institute for Fundamental Research, Universidade Estadual Paulista (Unesp), Stockholm University, Imperial College London, Institut polytechnique de Grenoble, Arcetri Astrophysical Observatory, University of Rome Tor Vergata, University of Zurich, Uppsala University, Princeton University, New York University
Subfield: Astronomy and Astrophysics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: gold
Estimated APC paid: $1,865
Awards: G1030305991, G2346881134, G372635447
OpenAlex ID: W7204954450