Euclid. A two-point correlation approach to diagnosing star-related systematics in the Euclid spectroscopic survey
Year: 2026
Type: preprint
Abstract: The Euclid spectroscopic survey will measure galaxy clustering with unprecedented precision, requiring stringent control of observational and instrumental systematics. Star-related effects may contaminate spectroscopic images through photometric persistence and imperfect masking of stars. We characterized their impact on galaxy clustering analyses, focusing on angular features identifiable in the data. We used angular and spatial auto- and cross-correlation statistics. For galaxies, we used mock spectroscopic catalogues from the EuclidLargeMocks in a 330 deg2 region of the Euclid Wide Survey (EWS). For stars, we used Gaia and 2MASS catalogues in the same area. To simulate photometric persistence, we implemented a simplified detector-level model calibrated on spectroscopic measurements and varied its strength to introduce different interloper fractions. For stellar masking, we modelled inconsistencies between the mask applied to the data and to the random catalogue. We measured star-star, galaxy-galaxy, and star-galaxy angular correlation functions using the Landy--Szalay estimator, and quantified deviations from the expected null star-galaxy correlation. We also evaluated the large-scale impact of such systematics through the three-dimensional two-point correlation function (2PCF). Photometric persistence produces a characteristic feature in the star-galaxy angular cross-correlation at scales of order 100", corresponding to the Euclid dithering pattern and grism dispersion geometry, and a spurious positive signal approximately constant up to 1°. Star-galaxy cross-correlation can detect residual persistence at contamination levels as low as 10% in a Data Release 1 spectroscopic catalogue. In contrast, stellar-mask mismatches produce strong small-scale angular signatures but have negligible impact on the large-scale 2PCF under realistic EWS conditions.
Source: arXiv (Cornell University)
Authors: Euclid Collaboration, Risso, I., Granett, B. R., Branchini, E., Veropalumbo, A., Kubik, B., Monaco, P., Comparat, J., Hall, A., Aghanim, N., Altieri, B., Amara, A., Andreon, S., Auricchio, N., Baccigalupi, C., Baldi, M., Balestra, A., Bardelli, S., Battaglia, P., Biviano, A., Bolzonella, M., Brescia, M., Camera, S., Cañas-Herrera, G., Capobianco, V., Carbone, C., Carretero, J., Castander, F. J., Castellano, M., Castignani, G., Cavuoti, S., Cimatti, A., Colodro-Conde, C., Congedo, G., Conversi, L., Copin, Y., Courbin, F., Courtois, H. M., Degaudenzi, H., de la Torre, S., De Lucia, G., Dole, H., Dubath, F., Dupac, X., Dusini, S., Escoffier, S., Farina, M., Farinelli, R., Ferriol, S., Finelli, F., Fourmanoit, N., Frailis, M., Franceschi, E., Fumana, M., Gabarra, L., Galeotta, S., George, K., Gillard, W., Gillis, B., Giocoli, C., Gracia-Carpio, J., Grazian, A., Grupp, F., Guzzo, L., Haugan, S. V. H., Hemmati, S., Holmes, W., Hormuth, F., Hornstrup, A., Jahnke, K., Jhabvala, M., Joachimi, B., Kermiche, S., Kiessling, A., Kümmel, M., Kunz, M., Kurki-Suonio, H., Brun, A. M. C. Le, Ligori, S., Lilje, P. B., Lindholm, V., Lloro, I., Magliocchetti, M., Mainetti, G., Mansutti, O., Marggraf, O., Martinelli, M., Martinet, N., Marulli, F., Massey, R. J., Mauri, N., Medinaceli, E., Melchior, M., Meneghetti, M., Merlin, E., Meylan, G., Mora, A., Moresco, M., Moretti, C., Moscardini, L., Nakajima, R., Neissner, C., Niemi, S. -M., Nightingale, J. W., Padilla, C., Paltani, S., 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., Rizzo, F., Romelli, E., Roncarelli, M., Rusholme, B., Saglia, R., Sakr, Z., Sánchez, A. G., Sapone, D., Sartoris, B., Schneider, P., Schrabback, T., Scodeggio, M., Secroun, A., Sihvola, E., Sirignano, C., Sirri, G., Stanco, L., Tallada-Crespí, P., Taylor, A. N., Tereno, I., Tessore, N., Toft, S., Toledo-Moreo, R., Torradeflot, F., Tutusaus, I., Valiviita, J., Vassallo, T., Wang, Y., Weller, J., Zamorani, G., Zerbi, F. M., Zucca, E., Ballardini, M., Bozzo, E., Burigana, C., Cabanac, R., Calabrese, M., Cappi, A., Caro, F., Castro, T., Vigo, J. A. Escartin, García-Bellido, J., Gasparetto, T., Macias-Perez, J., Maoli, R., Metcalf, R. B., Nucita, A. A., Pöntinen, M., Sarpa, E., Scottez, V., Sereno, M., Tenti, M., Tucci, M., Viel, M., Wiesmann, M., Barroso, J. A. Acevedo, Akrami, Y., Andika, I. T., Anselmi, S., Archidiacono, M., Aricò, G., Atrio-Barandela, F., Baes, M., Bazzanini, L., Bel, J., Bertacca, D., Bethermin, M., Beutler, F., Blot, L., Bonici, M., Brown, M. L., Bruton, S., Quevedo, B. Camacho, Carrilho, P., Carvalho, C. S., Cogato, F., Collett, T. E., Conseil, S., Contarini, S., Cooray, A. R., Corcho-Caballero, P., Csizi, B., Cucciati, O., Davini, S., de Boer, T., De Paolis, F., Desprez, G., Díaz-Sánchez, A., Di Domizio, S., Diego, J. M., Duret, V., Enia, A., Fang, Y., Farina, A., Finoguenov, A., Franco, A., Fu, Y., Ganga, K., Gaztanaga, E., Ghaffari, Z., Giacomini, F., Gianotti, F., Gozaliasl, G., Gruppuso, A., Guidi, M., Gutierrez, C. M., Hildebrandt, H., Hjorth, J., Jauzac, M., Kajava, J. J. E., Kang, Y., Kansal, V., Karagiannis, D., Kim, J., Kirkpatrick, C. C., Kovács, A., Kovačić, I., Koyama, K., Kruk, S., Lam, M. C., Leclercq, F., Legrand, L., Lembo, M., Leroy, G., Lesci, G. F., Lesgourgues, J., Liaudat, T. I., Linke, L., Liu, S. J., Mannucci, F., Marleau, F. R., Martins, C. J. A. P., Miluzio, M., Morgante, G., Nadathur, S., Naidoo, K., Navarro-Alsina, A., Nesseris, S., Nicastro, L., Oppizzi, F., Pace, F., Paoletti, D., Parimbelli, G., Passalacqua, F., Paterson, K., Patrizii, L., Pattison, C., Paviot, R., Pisani, A., Potter, D., Pratt, G. W., Quai, S., Radovich, M., Rodighiero, G., Roster, W., Sacquegna, S., Sahlén, M., Sanders, D. B., Schneider, A., Sciotti, D., Sellentin, E., Serjeant, S., Smith, L. C., Sorce, J. G., 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., Verza, G., Vinciguerra, S., von Wietersheim-Kramsta, M., Walton, N. A., Wang, L., Wright, A. H.
Institutions: Brera Astronomical Observatory, Istituto Nazionale di Fisica Nucleare, Sezione di Genova, University of Genoa, Lyon 1 Université, Centre National de la Recherche Scientifique, Institut National de Physique Nucléaire et de Physique des Particules, Institut de Physique des 2 Infinis de Lyon, University of Trieste, Trieste Astronomical Observatory, Istituto Nazionale di Fisica Nucleare, Sezione di Trieste, Institute for Fundamental Physics of the Universe, Institut polytechnique de Grenoble, Royal Observatory, University of Edinburgh, Université Paris-Saclay, Institut d'Astrophysique Spatiale, European Space Astronomy Centre, University of Surrey, Osservatorio di Astrofisica e Scienza dello Spazio, National Institute for Astrophysics, Scuola Internazionale Superiore di Studi Avanzati, Istituto Nazionale di Fisica Nucleare, Sezione di Bologna, University of Bologna, Osservatorio Astronomico di Padova, 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, 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, Instituto de Astrofísica de Canarias, European Space Agency, European Space Research Institute, Institució Catalana de Recerca i Estudis Avançats, Institute of Space Sciences, Institut de Ciències del Cosmos, University of Geneva, Aix-Marseille Université, Istituto Nazionale di Fisica Nucleare, Sezione di Padova, Centre de physique des particules de Marseille, Institute for Space Astrophysics and Planetology, University of Oxford, Ludwig-Maximilians-Universität München, Max Planck Institute for Extraterrestrial Physics, University of Milan, Istituto Nazionale di Fisica Nucleare, Sezione di Milano, University of Oslo, California Institute of Technology, Infrared Processing and Analysis Center, 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, University of Bonn, Istituto Nazionale di Fisica Nucleare, Sezione di Roma I, Durham University, FHNW University of Applied Sciences and Arts Northwestern Switzerland, École Polytechnique Fédérale de Lausanne, Institute for High Energy Physics, European Space Research and Technology Centre, Newcastle University, University of Waterloo, Perimeter Institute, Université Paris Cité, Commissariat à l'Énergie Atomique et aux Énergies Alternatives, Astrophysique, Instrumentation et Modélisation, Agenzia Spaziale Italiana, Centre National d'Études Spatiales, Institute of Space Science - INFLPR Subsidiary, University of Padua, 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, University of Ferrara, Istituto Nazionale di Fisica Nucleare, Sezione di Ferrara, 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, Sapienza University of Rome, University of Salento, Istituto Nazionale di Fisica Nucleare, Sezione di Lecce, Université Catholique de Lille, Institut d'Astrophysique de Paris, JUNIA, Fondazione ICSC Centro Nazionale di Ricerca in High Performance Computing, Big Data e Quantum Computing, Case Western Reserve University, Laboratoire Univers et Théories, Universidad de Salamanca, Ghent University, Université de Toulon, Observatoire astronomique de Strasbourg, Université de Strasbourg, Kavli Institute for the Physics and Mathematics of the Universe, University of Manchester, University of Hertfordshire, University of Portsmouth, University of California, Irvine, University of Groningen, University of Hawaiʻi at Mānoa, University of Hawaii System, Instituto de Física de Cantabria, Aalto University, Universidad de La Laguna, Ruhr University Bochum, 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, CEA Paris-Saclay, Institut de Recherche sur les Lois Fondamentales de l'Univers, Arcetri Astrophysical Observatory, Universidade do Porto, Centro de Astrofísica da Universidade do Porto, University of Zurich, Collurania Teramo Observatory, Uppsala University, The Open University, University of Cambridge, Université de Lille, Centre de Recherche en Informatique, Signal et Automatique de Lille, Centrale Lille Institut, 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, University of Oulu, The Abdus Salam International Centre for Theoretical Physics (ICTP), Flatiron Institute, Space Research Organisation Netherlands
Language: English
Subfield: Astronomy and Astrophysics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
Funders: National Science Foundation, National Aeronautics and Space Administration, California Institute of Technology, European Space Agency, European Commission, Generalitat de Catalunya, Ministero dell’Istruzione, dell’Università e della Ricerca, Magyar Tudományos Akadémia, Agenzia Spaziale Italiana, National Astronomical Observatory of Japan, Agenția Spațială Română, Norsk Romsenter, Institut de Física d'Altes Energies, Fundação para a Ciência e a Tecnologia, Innovate UK, Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas, Agencia Estatal de Investigación
Awards: G1175115578, G120905174, G1849103467, G2001838499, G2064873908, G210041235, G2262748287, G2452073530, G2462415295, G2469010403, G2601397997, G2650114919, G3005324705, G300979063, G308504231, G34346518, G3480869486, G3546882995, G3681454997, G4042783231, G4203315169, G425668148, G4526231891, Euclid Legacy Science Advanced analysis tools, G490430286, G5080475149, G5195188938, Euclid Legacy Science Advanced analysis tools, G5385376234, G5922099756, G5969143191, G69051668, G7084143925, G899293041, G972786147
OpenAlex ID: W7211907321