Euclid Data Release 1 (DR1). The PHZ processing function for the physical properties of galaxies
Year: 2026
Type: preprint
Abstract: Euclid is a European Space Agency mission mapping the extragalactic sky, aiming to provide the most-accurate 3D view of the Universe at optical and near-infrared wavelengths, by measuring the photometric redshifts of billions of galaxies. Within the Euclid Consortium, this task is executed by the PHZ Organisation Unit. PHZ takes as input the multi-wavelength photometry of Euclid and ground-based data, and returns as output the source classification, photometric redshifts for the Euclid core science (i.e., cosmology), and photometric redshifts plus physical parameters and absolute magnitudes for non-cosmological science. As part of the first Euclid Data Release (DR1), we describe the details of the DR1 pipeline for non-cosmological science, along with the released data products, and their validation. The non-cosmological science data products are obtained with NNPZ, a nearest-neighbour algorithm developed within PHZ that infers the properties of each target galaxy from its closest matches, in colour-magnitude space, within a reference sample of galaxies with known redshifts and physical parameters. We built this reference sample from Euclid observations of COSMOS, one of the Euclid Auxiliary Fields, labelling each galaxy with redshifts and physical parameters derived from the COSMOS2020 multi-wavelength photometry, consistently with the Euclid core-science results. Combined with the adjustments and priors required to generalise the results across the entire extragalactic sky, this approach yields high-quality and internally consistent data products. We tested the performance using both internal metrics and comparisons to ancillary data sets (e.g., COSMOS2020, 3D-HST, and DESI) and scaling relations (e.g., the star-forming main sequence); the results are in line with expectations and pre-DR1 simulations for both the Euclid Wide Survey and Euclid Deep Fields.
Source: arXiv (Cornell University)
Authors: Euclid Collaboration, Enia, A., Hartley, W. G., Bolzonella, M., Dubath, F., Paltani, S., Pozzetti, L., Saulder, C., Tucci, M., Morisset, N., Scott, D., Salvato, M., Hildebrandt, H., Sorce, J. G., Zamorani, G., Altieri, B., Amara, A., Andreon, S., Auricchio, N., Baccigalupi, C., Baldi, M., Balestra, A., Bardelli, S., Battaglia, P., Belikov, A. N., Biviano, A., Branchini, E., Brescia, M., Camera, S., Capobianco, V., Carbone, C., Carretero, J., Castander, F. J., Castellano, M., Castignani, G., Cavuoti, S., Chambers, K. C., Cimatti, A., Colodro-Conde, C., Congedo, G., Conselice, C. J., Conversi, L., Copin, Y., Costille, A., Courbin, F., Courtois, H. M., Cropper, M., Degaudenzi, H., De Lucia, G., Dole, H., Dupac, X., Escoffier, S., Farina, M., Farinelli, R., Farrens, S., Faustini, F., Ferriol, S., Finelli, F., Fosalba, P., Fourmanoit, N., Frailis, M., Franceschi, E., Fumana, M., Gabarra, L., Galeotta, S., George, K., Gillis, B., Giocoli, C., Gracia-Carpio, J., Grazian, A., Grupp, F., Gwyn, S., Haugan, S. V. H., Hemmati, S., Hoekstra, H., Holmes, W., Hormuth, F., Hornstrup, A., Huertas-Company, M., Jahnke, K., Jhabvala, M., Joachimi, B., Kermiche, S., Kiessling, A., Kubik, B., Kümmel, M., Kunz, M., Kurki-Suonio, H., Brun, A. M. C. Le, Brun, V. Le, Mignant, D. Le, Liebing, P., Ligori, S., Lilje, P. B., Lindholm, V., Lloro, I., Magliocchetti, M., Mainetti, G., Maino, D., Mansutti, O., Marcin, S., Marggraf, O., Martinelli, M., Martinet, N., Marulli, F., Massey, R. J., Masters, D. C., Mauri, N., Medinaceli, E., Mei, S., Melchior, M., Meneghetti, M., Merlin, E., Meylan, G., Mohr, J. J., Monaco, P., Mora, A., Moresco, M., Moretti, C., Moscardini, L., Nakajima, R., Neissner, C., Niemi, S. -M., Padilla, C., Pasian, F., Percival, W. J., Pettorino, V., Pezzotta, A., Pires, S., Polenta, G., Poncet, M., Popa, L. A., Raison, F., Renzi, A., Rhodes, J., Riccio, G., Risso, I., Rizzo, F., Romelli, E., Roncarelli, M., Rusholme, B., Saglia, R., Sakr, Z., Sánchez, A. G., Sapone, D., Sartoris, B., Schirmer, M., Schneider, P., Schrabback, T., Scodeggio, M., Secroun, A., Sihvola, E., Sirignano, C., Sirri, G., Stanco, L., Tallada-Crespí, P., Taylor, A. N., Teplitz, H. I., Tereno, I., Tessore, N., Toft, S., Toledo-Moreo, R., Torradeflot, F., Tutusaus, I., Valiviita, J., Vassallo, T., Wang, Y., Weller, J., Zacchei, A., Zerbi, F. M., Zinchenko, I. A., Zucca, E., Allevato, V., Ballardini, M., Borgani, S., Bozzo, E., Burigana, C., Cabanac, R., Calabrese, M., Cappi, A., Caro, F., Castro, T., Di Ferdinando, D., Vigo, J. A. Escartin, Fabbian, G., García-Bellido, J., Gasparetto, T., Gautard, V., Gutierrez, C. M., Loureiro, A., Macias-Perez, J., Mancini, C., Maoli, R., Metcalf, R. B., Pöntinen, M., Sarpa, E., Scottez, V., Sereno, M., Tenti, M., Viel, M., Wiesmann, M., Barroso, J. A. Acevedo, Adam, R., Akrami, Y., Andika, I. T., Angora, G., Anselmi, S., Archidiacono, M., Aricò, G., Atrio-Barandela, F., Aubourg, E., Baes, M., Bazzanini, L., Bertacca, D., Bethermin, M., Beutler, F., Bisigello, L., Blanchard, A., Blot, L., Böhringer, H., Bonici, M., Brown, M. L., Bruton, S., Calabro, A., Quevedo, B. Camacho, Carvalho, C. S., Cogato, F., Collett, T. E., Cooray, A. R., Corcho-Caballero, P., Csizi, B., Cucciati, O., Dannerbauer, H., de Boer, T., Desprez, G., Díaz-Sánchez, A., Di Domizio, S., Diego, J. M., Duret, V., Fang, Y., Farina, A., Ferguson, A. M. N., Finoguenov, A., Fontana, A., Franco, A., Fu, Y., Ganga, K., Gavazzi, R., Gaztanaga, E., Ghaffari, Z., Giacomini, F., Gianotti, F., Gozaliasl, G., Gruppuso, A., Guidi, M., Hall, A., Hatch, N. A., Hernández-Monteagudo, C., Hjorth, J., Jauzac, M., Kajava, J. J. E., Kang, Y., Kansal, V., Karagiannis, D., Kim, J., Kirkpatrick, C. C., Kovács, A., Kova{č}i{ć}, I., Koyama, K., Kruk, S., Lam, M. C., Lattanzi, M., Legrand, L., Lembo, M., Leroy, G., Lesci, G. F., Lesgourgues, J., Linke, L., Liu, S. J., Maggio, G., Mannucci, F., Marleau, F. R., Martins, C. J. A. P., Miluzio, M., Morgante, G., Nadathur, S., Naidoo, K., Navarro-Alsina, A., Nersesian, A., Nesseris, S., Nicastro, L., Oppizzi, F., Pace, F., Paoletti, D., Parimbelli, G., Passalacqua, F., Paterson, K., Pattison, C., Pello, R., Pisani, A., Potter, D., Pratt, G. W., Quai, S., Radovich, M., Ricci, F., Rodighiero, G., Roster, W., Sahlén, M., Sanders, D. B., Schneider, A., Sciotti, D., Sellentin, E., Serjeant, S., Shankar, F., Smith, L. C., Stanford, S. A., Szapudi, I., Talia, M., Tanidis, K., Tao, C., Tarsitano, F., Testera, G., Teyssier, R., Tosi, S., Troja, A., Uhlemann, C., Valieri, C., Venhola, A., Vergani, D., Vielzeuf, P., Vinciguerra, S., von Wietersheim-Kramsta, M., Walton, N. A., Wang, L., Weaver, J. R., Wright, A. H.
Institutions: Commissariat à l'Énergie Atomique et aux Énergies Alternatives, CEA Paris-Saclay - Etablissement de Saclay, Institut de Recherche sur les Lois Fondamentales de l'Univers, Osservatorio di Astrofisica e Scienza dello Spazio, National Institute for Astrophysics, University of Geneva, Max Planck Institute for Extraterrestrial Physics, Ludwig-Maximilians-Universität München, University of British Columbia, Ruhr University Bochum, Centre National de la Recherche Scientifique, 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, University of Surrey, Brera Astronomical Observatory, 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, Osservatorio Astronomico di Padova, University of Groningen, ATG Europe (Netherlands), 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, Port d'Informació Científica, Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas, Institut d'Estudis Espacials de Catalunya, Astronomical Observatory of Rome, 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, University of Manchester, European Space Agency, 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, Aix-Marseille Université, Institució Catalana de Recerca i Estudis Avançats, Institute of Space Sciences, Institut de Ciències del Cosmos, University College London, Centre de physique des particules de Marseille, Institute for Space Astrophysics and Planetology, Université Paris Cité, Astrophysique, Instrumentation et Modélisation, University of Oxford, Herzberg Institute of Astrophysics, National Research Council Canada, University of Oslo, California Institute of Technology, Infrared Processing and Analysis Center, Leiden University, Leiden Observatory, Jet Propulsion Laboratory, Technical University of Denmark, Université Paris Sciences et Lettres, Observatoire de Paris, Sorbonne Université, Laboratoire d’Etudes du Rayonnement et de la Matière en Astrophysique et Atmosphères, Max Planck Institute for Astronomy, Goddard Space Flight Center, University of Helsinki, Helsinki Institute of Physics, 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, Istituto Nazionale di Fisica Nucleare, Sezione di Roma I, Durham University, Centre Pierre Binétruy, University of California, Berkeley, École Polytechnique Fédérale de Lausanne, University of Trieste, Institute for High Energy Physics, European Space Research and Technology Centre, University of Waterloo, Perimeter Institute, Agenzia Spaziale Italiana, Centre National d'Études Spatiales, Institute of Space Science - INFLPR Subsidiary, University of Padua, Istituto Nazionale di Fisica Nucleare, Sezione di Padova, Consejo Superior de Investigaciones Científicas, Saint Joseph University, Instituto de Física Teórica, Institut de Recherche en Astrophysique et Planétologie, University of Chile, Universität Innsbruck, University of Lisbon, Institute of Astrophysics and Space Sciences, University of Copenhagen, European Union, Universidad Politécnica de Cartagena, Heidelberg University, University of Ferrara, Istituto Nazionale di Fisica Nucleare, Sezione di Ferrara, Fondazione ICSC Centro Nazionale di Ricerca in High Performance Computing, Big Data e Quantum Computing, Istituto di Radioastronomia di Bologna, Osservatorio Astronomico della Regione Autonoma Valle d'Aosta, Regione Autonoma Valle d'Aosta, Université Côte d'Azur, Lagrange Laboratory, Observatoire de la Côte d’Azur, Universidade de São Paulo, Universidad de La Laguna, Stockholm University, Imperial College London, Institut polytechnique de Grenoble, Sapienza University of Rome, Université Catholique de Lille, Institut d'Astrophysique de Paris, JUNIA, Case Western Reserve University, Laboratoire Univers et Théories, Universidad de Salamanca, CEA Paris-Saclay, Ghent University, Observatoire astronomique de Strasbourg, Université de Strasbourg, Kavli Institute for the Physics and Mathematics of the Universe, Max Planck Institute for Physics, University of Portsmouth, University of California, Irvine, Instituto de Física de Cantabria, University of Salento, Istituto Nazionale di Fisica Nucleare, Sezione di Lecce, Aalto University, University of Nottingham, University of KwaZulu-Natal, University of Turku, ARC Centre of Excellence for Dark Matter Particle Physics, Swinburne University of Technology, University of the Western Cape, Konkoly Observatory, HUN-REN Research Centre for Astronomy and Earth Sciences, Centro Brasileiro de Pesquisas Físicas, Arcetri Astrophysical Observatory, Universidade do Porto, Centro de Astrofísica da Universidade do Porto, University of Liège, University of Zurich, Roma Tre University, Uppsala University, The Open University, University of Southampton, University of Cambridge, University of California, Davis, University of Nova Gorica, ETH Zurich, Institute for Particle Physics and Astrophysics, Kobayashi-Maskawa Institute for the Origin of Particles and the Universe, Nagoya University, Princeton University, Bielefeld University, Newcastle University, University of Oulu, Space Research Organisation Netherlands, Massachusetts Institute of Technology
Language: English
Subfield: Astronomy and Astrophysics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W7226008292
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