: Photometric redshift calibration performance with the clustering-redshifts technique in the Flagship 2 simulation
Year: 2025
Type: article
Abstract: Aims. The precision of cosmological constraints from imaging surveys hinges on an accurately estimated redshift distribution n(z) of the tomographic bins, especially their mean redshifts. We assess the effectiveness of the clustering-redshifts technique in constraining Euclid tomographic redshift bins to meet the target uncertainty of σ(⟨z⟩) < 0.002(1 + z). We inferred these mean redshifts from the small-scale angular clustering of Euclid galaxies, which were distributed into bins with spectroscopic samples localised in narrow redshift slices. Methods. We generated spectroscopic mocks from the Flagship2 simulation for the Baryon Oscillation Spectroscopic Survey (BOSS), the Dark Energy Spectroscopic Instrument (DESI), and the Euclid Near-Infrared Spectrometer and Photometer (NISP) spectroscopic survey. We evaluated and optimised the clustering-redshifts pipeline, and we introduced a new method for measuring the photometric galaxy bias (clustering), which is the primary limitation of this technique. Results. We have successfully constrained the means and standard deviations of the redshift distributions for all of the tomographic bins (with a maximum photometric redshift of 1.6). We achieved precision beyond the required thresholds. We have identified the main sources of bias, particularly the impact of the one-halo galaxy distribution, which imposed the minimal separation scale to be larger than 1.5 Mpc for evaluating cross-correlations. These results demonstrate that clustering-redshifts can meet the precision requirements for Euclid, and we highlighted several avenues for future improvements.
Authors: W. d’Assignies, M. Manera, C. Padilla, O. Ilbert, H. Hildebrandt, L. Reynolds, J. Chaves-Montero, A. H. Wright, P. Tallada-Crespí, M. Eriksen, J. Carretero, W. Roster, Y. Kang, K. Naidoo, R. Miquel, B. Altieri, A. Amara, S. Andreon, N. Auricchio, C. Baccigalupi, D. Bagot, M. Baldi, A. Balestra, S. Bardelli, P. Battaglia, A. Biviano, E. Branchini, M. Brescia, S. Camera, V. Capobianco, C. Carbone, V. F. Cardone, S. Casas, F. J. Castander, M. Castellano, G. Castignani, S. Cavuoti, K. C. Chambers, A. Cimatti, C. Colodro-Conde, G. Congedo, C. J. Conselice, L. Conversi, Y. Copin, F. Courbin, H. M. Courtois, M. Crocce, A. Da Silva, H. Degaudenzi, S. de la Torre, G. De Lucia, M. Douspis, X. Dupac, A. Ealet, S. Escoffier, M. Farina, F. Faustini, S. Ferriol, F. Finelli, P. Fosalba, S. Fotopoulou, M. Frailis, E. Franceschi, M. Fumana, S. Galeotta, K. George, B. Gillis, C. Giocoli, P. Gómez-Alvarez, J. Gracia-Carpio, A. Grazian, F. Grupp, W. Holmes, I. M. Hook, A. Hornstrup, K. Jahnke, M. Jhabvala, B. Joachimi, E. Keihänen, S. Kermiche, A. Kiessling, B. Kubik, M. Kümmel, M. Kunz, H. Kurki-Suonio, O. Lahav, 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, K. Markovic, M. Martinelli, N. Martinet, F. Marulli, R. Massey, D. C. Masters, E. Medinaceli, S. Mei, M. Melchior, Y. Mellier, M. Meneghetti, E. Merlin, G. Meylan, A. Mora, M. Moresco, L. Moscardini, C. Neissner, S.-M. Niemi, 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, E. Rossetti, R. Saglia, Z. Sakr, D. Sapone, B. Sartoris, J. A. Schewtschenko, P. Schneider, T. Schrabback, A. Secroun, E. Sefusatti, G. Seidel, M. Seiffert, S. Serrano, P. Simon, C. Sirignano, G. Sirri, A. Spurio Mancini, L. Stanco, J. Steinwagner, D. Tavagnacco, A. N. Taylor, H. I. Teplitz, I. Tereno, N. Tessore, S. Toft, R. Toledo-Moreo, F. Torradeflot, A. Tsyganov, I. Tutusaus, L. Valenziano, J. Valiviita, T. Vassallo, G. Verdoes Kleijn, Y. Wang, J. Weller, G. Zamorani, E. Zucca, M. Bolzonella, C. Burigana, L. Gabarra, J. Martín-Fleitas, I. Risso, V. Scottez, M. Viel
Institutions: University of Helsinki, Centre National de la Recherche Scientifique, Institut d'Estudis Espacials de Catalunya, Istituto Nazionale di Fisica Nucleare, Sezione di Napoli, University of Hawaiʻi at Mānoa, University of Hawaii System, University of Bologna, 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, Institut de Ciències del Cosmos, Universitat de Barcelona, University of Lisbon, Institute of Astrophysics and Space Sciences, Université Paris-Saclay, Institut d'Astrophysique Spatiale, FHNW University of Applied Sciences and Arts Northwestern Switzerland, Aix-Marseille Université, Centre de physique des particules de Marseille, Institute for Space Astrophysics and Planetology, Agenzia Spaziale Italiana, Istituto Nazionale di Fisica Nucleare, Sezione di Bologna, University of Bristol, Ludwig-Maximilians-Universität München, California Institute of Technology, Jet Propulsion Laboratory, Lancaster University, Technical University of Denmark, Max Planck Institute for Astronomy, Goddard Space Flight Center, University College London, Helsinki Institute of Physics, University of Geneva, Université Paris Sciences et Lettres, Observatoire de Paris, Sorbonne Université, Laboratoire d'Étude de l'Univers et des Phénomènes Extrêmes, University of Oslo, 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, University of Bonn, Durham University, Infrared Processing and Analysis Center, Université Paris Cité, Laboratoire AstroParticule et Cosmologie, Centre Pierre Binétruy, University of California, Berkeley, Institut d'Astrophysique de Paris, École Polytechnique Fédérale de Lausanne, European Space Astronomy Centre, European Space Research and Technology Centre
Language: English
Subfield: Astronomy and Astrophysics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
Funders: National Aeronautics and Space Administration, Centres de Recerca de Catalunya, European Space Agency, Generalitat de Catalunya, Magyar Tudományos Akadémia, Agenzia Spaziale Italiana, Ministerio de Ciencia e Innovación, National Astronomical Observatory of Japan, Agenția Spațială Română, Norsk Romsenter, Institut de Física d'Altes Energies, Fundação para a Ciência e a Tecnologia, Agència de Gestió d'Ajuts Universitaris i de Recerca, Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas, Agencia Estatal de Investigación
Awards: G1175115578, G121809054, G1272927172, G1855990336, G2038104832, G2064873908, G2262748287, G2309174360, G2355262757, G244236004, G2452073530, G2575991346, G2650114919, G2660406951, G270620391, G279363373, G288263039, G2988934680, G3005324705, G300979063, G308504231, G3215885808, G34346518, G3480869486, G3518538256, G3546882995, G363809202, G3690828678, G425668148, G430777504, G4526231891, G4580280681, G5080475149, G5094610163, G5385376234, G5416399836, G5421974903, G5852091828, G5922099756, G6027777510, G6656126374, G69051668, G6934589879, G7084143925, G7425137858, G7824355187, G8186726090, G8546142835, G8637226926, G8684520763, G8920660035, G897484643, G99296377
OpenAlex ID: W7127067315
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