Euclid preparation
Year: 2026
Type: article
Abstract: We present the first end-to-end validation of the Euclid baryon acoustic oscillation (BAO) analysis pipeline, encompassing density-field reconstruction, two-point correlation function measurement, and cosmological parameter inference. Using eight Euclid -like mock catalogues extracted from each of the four snapshots of the Flagship 1 (FS1) simulation, which is designed to replicate the statistical properties of the first Euclid data release (DR1), we assessed the performance of the two standard BAO reconstruction methods based on the Zeldovich approximation, R EC S YM and R EC I SO , in four redshift snapshots (0.9 ≤ z ≤ 1.8). The pipeline introduces several methodological advances: an emulator-based model evaluator ( Bora.jl ) combined with a Hamiltonian Monte Carlo sampler ( NUTS ), achieving a speed-up of more than 500 times relative to standard Monte Carlo Markov chains, and a semi-analytical covariance estimator ( BeXiCov+WinCov ) that enables robust error estimates with only eight mock realisations and remains stable under variations in the fiducial cosmology. Together, these components ensure computational efficiency while significantly reducing the risk of underestimating the parameter uncertainties. The two reconstruction schemes yield unbiased BAO measurements for all redshifts and user-defined choices, including the smoothing scale and fiducial cosmology. In each snapshot, reconstruction enhances the figure of merit for {Ω m , H 0 r s } by a factor of ∼3, which is equivalent to tripling the effective survey volume. When we combined the four redshift bins, the improvement remained substantial, with BAO-only constraints reaching ∼10% precision on Ω m and ∼3% on H 0 r s . The results from R EC S YM and R EC I SO are consistent within the uncertainties, but we recommend R EC S YM during testing because its sensitivity to covariance variations is lower. These findings establish the accuracy, robustness, and scalability of the Euclid BAO pipeline for DR1 and provide a solid foundation for future cosmological analyses.
Source: Astronomy and Astrophysics
Authors: E. Sarpa, A. Veropalumbo, M. Bonici, M. Kärcher, M. Crocce, E. Sefusatti, E. Maragliano, E. Branchini, C. Oliveri, G. Gambardella, B. Camacho Quevedo, C. Moretti, P. Monaco, J. Bautista, M. Viel, W. J. Percival, S. Nadathur, A. Pezzotta, A. Eggemeier, A. G. Sánchez, J. Bel, C. Carbone, A. Crespi, S. Radinović, G. Parimbelli, A. Farina, I. Risso, M. Guidi, G. Degni, D. Eisenstein, F. Beutler, C. García-García, G. Piccirilli, J. G. Sorce, B. Altieri, S. Andreon, C. Baccigalupi, M. Baldi, S. Bardelli, P. Battaglia, A. Biviano, M. Brescia, S. Camera, G. Cañas-Herrera, V. Capobianco, J. Carretero, 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, H. Degaudenzi, S. de la Torre, G. De Lucia, F. Dubath, X. Dupac, S. Escoffier, M. Farina, R. Farinelli, F. Faustini, S. Ferriol, F. Finelli, P. Fosalba, N. Fourmanoit, M. Frailis, E. Franceschi, M. Fumana, S. Galeotta, K. George, W. Gillard, B. Gillis, C. Giocoli, J. Gracia-Carpio, A. Grazian, F. Grupp, L. Guzzo, S. V. H. Haugan, W. Holmes, F. Hormuth, A. Hornstrup, K. Jahnke, M. Jhabvala, B. Joachimi, S. Kermiche, A. Kiessling, 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, O. Mansutti, O. Marggraf, M. Martinelli, N. Martinet, F. Marulli, R. J. Massey, E. Medinaceli, S. Mei, M. Melchior, 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, F. Raison, J. Rhodes, G. Riccio, F. Rizzo, E. Romelli, M. Roncarelli, R. Saglia, Z. Sakr, D. Sapone, M. Schirmer, P. Schneider, T. Schrabback, M. Scodeggio, A. Secroun, E. Sihvola, C. Sirignano, G. Sirri, L. Stanco, P. Tallada-Crespí, D. Tavagnacco, A. N. Taylor, I. Tereno, N. Tessore, S. Toft, R. Toledo-Moreo, F. Torradeflot, I. Tutusaus, L. Valenziano, J. Valiviita, T. Vassallo, G. Verdoes Kleijn, Y. Wang, J. Weller, A. Zacchei, G. Zamorani, F. M. Zerbi, E. Zucca, M. Ballardini, A. Boucaud, E. Bozzo, C. Burigana, R. Cabanac, M. Calabrese, A. Cappi, T. Castro, J. A. Escartin Vigo, G. Fabbian, J. García-Bellido, J. Macias-Perez, R. Maoli, J. Martín-Fleitas, N. Mauri, R. B. Metcalf, M. Pöntinen, V. Scottez, M. Sereno, M. Tenti, M. Tucci, M. Wiesmann, Y. Akrami, I. T. Andika, M. Archidiacono, F. Atrio-Barandela, E. Aubourg, L. Bazzanini, D. Bertacca, M. Bethermin, A. Blanchard, L. Blot, S. Borgani, M. L. Brown, S. Bruton, A. Calabro, F. Caro, C. S. Carvalho, F. Cogato, S. Contarini, A. R. Cooray, O. Cucciati, S. Davini, T. de Boer, F. De Paolis, G. Desprez, A. Díaz-Sánchez, S. Di Domizio, J. M. Diego, V. Duret, M. Y. Elkhashab, Y. Fang, P. G. Ferreira, A. Finoguenov, A. Franco, K. Ganga, T. Gasparetto, E. Gaztanaga, Z. Ghaffari, F. Giacomini, F. Gianotti, E. J. Gonzalez, G. Gozaliasl, A. Gruppuso, C. M. Gutierrez, A. Hall, H. Hildebrandt, J. Hjorth, J. J. E. Kajava, Y. Kang, V. Kansal, D. Karagiannis, K. Kiiveri, J. Kim, C. C. Kirkpatrick, K. Koyama, S. Kruk, M. C. Lam, F. Leclercq, L. Legrand, M. Lembo, F. Lepori, G. Leroy, G. F. Lesci, J. Lesgourgues, T. I. Liaudat, S. J. Liu, M. Magliocchetti, C. J. A. P. Martins, L. Maurin, M. Migliaccio, M. Miluzio, G. Morgante, K. Naidoo, A. Navarro-Alsina, S. Nesseris, F. Pace, D. Paoletti, K. Paterson, L. Patrizii, C. Pattison, A. Pisani, D. Potter, A. Pourtsidou, G. W. Pratt, S. Quai, M. Radovich, G. Rodighiero, W. Roster, S. Sacquegna, M. Sahlén, D. B. Sanders, A. Schneider, D. Sciotti, E. Sellentin, L. C. Smith, I. Szapudi, K. Tanidis, C. Tao, F. Tarsitano, G. Testera, R. Teyssier, S. Tosi, A. Troja, C. Uhlemann, C. Valieri, F. Vernizzi, G. Verza, S. Vinciguerra, M. von Wietersheim-Kramsta, N. A. Walton, A. H. Wright, H. W. Yeung
Institutions: Trieste Astronomical Observatory, National Institute for Astrophysics, Brera Astronomical Observatory, Istituto Nazionale di Fisica Nucleare, Sezione di Genova, University of Genoa, University of Waterloo, University of Milan, Institute of Space Sciences, Institut d'Estudis Espacials de Catalunya, Universitat Politècnica de Catalunya, Istituto Nazionale di Fisica Nucleare, Sezione di Trieste, Institute for Fundamental Physics of the Universe, Scuola Internazionale Superiore di Studi Avanzati, University of Trieste, Centre National de la Recherche Scientifique, Aix-Marseille Université, Centre de physique des particules de Marseille, Institut National de Physique Nucléaire et de Physique des Particules, Fondazione ICSC Centro Nazionale di Ricerca in High Performance Computing, Big Data e Quantum Computing, Perimeter Institute, University of Portsmouth, University of Bonn, Max Planck Institute for Extraterrestrial Physics, Université de Toulon, Centre de Physique Théorique, University of Oslo, Osservatorio di Astrofisica e Scienza dello Spazio, University of Bologna, Center for Astrophysics Harvard & Smithsonian, Royal Observatory, University of Edinburgh, University of Rome Tor Vergata, Istituto Nazionale di Fisica Nucleare, Roma Tor Vergata, Université de Lille, Université Paris-Saclay, Institut d'Astrophysique Spatiale, Centre de Recherche en Informatique, Signal et Automatique de Lille, Centrale Lille Institut, European Space Astronomy Centre, Istituto Nazionale di Fisica Nucleare, Sezione di Bologna, Astronomical Observatory of Capodimonte, University of Naples Federico II, Istituto Nazionale di Fisica Nucleare, Sezione di Torino, Osservatorio Astrofisico di Torino, University of Turin, Leiden University, Leiden Observatory, Universitat Autònoma de Barcelona, Port d'Informació Científica, Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas, Astronomical Observatory of Rome, 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, European Space Agency, European Space Research Institute, Lyon 1 Université, Institut de Physique des 2 Infinis de Lyon, Institució Catalana de Recerca i Estudis Avançats, Consejo Superior de Investigaciones Científicas, Institut de Ciències del Cosmos, Universitat de Barcelona, University of Geneva, Institute for Space Astrophysics and Planetology, Ludwig-Maximilians-Universität München, Osservatorio Astronomico di Padova, Istituto Nazionale di Fisica Nucleare, Sezione di Milano, Jet Propulsion Laboratory, Technical University of Denmark, Max Planck Institute for Astronomy, Goddard Space Flight Center, University College London, University of Helsinki, 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, Istituto Nazionale di Fisica Nucleare, Sezione di Roma I, Durham University, Université Paris Cité, Centre Pierre Binétruy, University of California, Berkeley, FHNW University of Applied Sciences and Arts Northwestern Switzerland, École Polytechnique Fédérale de Lausanne, Institute for High Energy Physics, Barcelona Institute of Science and Technology, European Space Research and Technology Centre, University of Copenhagen, Commissariat à l'Énergie Atomique et aux Énergies Alternatives, Astrophysique, Instrumentation et Modélisation, Agenzia Spaziale Italiana, Centre National d'Études Spatiales, Université Toulouse III - Paul Sabatier, Saint Joseph University, Instituto de Física Teórica, Institut de Recherche en Astrophysique et Planétologie, Université de Toulouse, University of Chile, Universität Innsbruck, University of Padua, Istituto Nazionale di Fisica Nucleare, Sezione di Padova, University of Lisbon, Institute of Astrophysics and Space Sciences, Universidad Politécnica de Cartagena, University of Groningen, California Institute of Technology, Infrared Processing and Analysis Center, University of Ferrara, Istituto Nazionale di Fisica Nucleare, Sezione di Ferrara, Istituto di Radioastronomia di Bologna, Osservatorio Astronomico della Regione Autonoma Valle d'Aosta, Université Côte d'Azur, Lagrange Laboratory, Observatoire de la Côte d’Azur, Institut polytechnique de Grenoble, Université Grenoble Alpes, Sapienza University of Rome, Université Catholique de Lille, Institut d'Astrophysique de Paris, Case Western Reserve University, Universidad de Salamanca, CEA Paris-Saclay - Etablissement de Saclay, Institut de Recherche sur les Lois Fondamentales de l'Univers, Observatoire astronomique de Strasbourg, Université de Strasbourg, Kavli Institute for the Physics and Mathematics of the Universe, The University of Tokyo, University of Manchester, University of California, Irvine, University of Salento, Istituto Nazionale di Fisica Nucleare, Sezione di Lecce, Instituto de Física de Cantabria, University of Oxford, Consejo Nacional de Investigaciones Científicas y Técnicas, Instituto de Astronomía Teórica y Experimental, Aalto University, Universidad de La Laguna, Ruhr University Bochum, University of Turku, ARC Centre of Excellence for Dark Matter Particle Physics, Swinburne University of Technology, University of the Western Cape, University of Cambridge, RWTH Aachen University, Universidade do Porto, Centro de Astrofísica da Universidade do Porto, University of Zurich, Collurania Teramo Observatory, Uppsala University, University of Nova Gorica, ETH Zurich, Institute for Particle Physics and Astrophysics, Princeton University, Bielefeld University, Newcastle University, Institut de Physique Théorique, The Abdus Salam International Centre for Theoretical Physics (ICTP), 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: W7212184547