2mass-planck-allsky

Euclid preparation: CIX. Baryon acoustic oscillation analysis of photometric galaxy clustering in configuration space

September 2026 • 2026A&A...713A.281E

Authors • Euclid Collaboration • Duret, V. • Escoffier, S. • Gillard, W. • Tutusaus, I. • Camera, S. • Tessore, N. • Castander, F. J. • Aghanim, N. • Amara, A. • Amendola, L. • Andreon, S. • Auricchio, N. • Baccigalupi, C. • Baldi, M. • Bardelli, S. • Battaglia, P. • Biviano, A. • Bonino, D. • Branchini, E. • Brescia, M. • Brinchmann, J. • Caillat, A. • Cañas-Herrera, G. • Capobianco, V. • Carbone, C. • Cardone, V. F. • Carretero, J. • Casas, S. • Castellano, M. • Castignani, G. • Cavuoti, S. • Chambers, K. C. • Cimatti, A. • Colodro-Conde, C. • Congedo, G. • Conselice, C. J. • Conversi, L. • Copin, Y. • Courbin, F. • Courtois, H. M. • Cropper, M. • Da Silva, A. • Degaudenzi, H. • de la Torre, S. • De Lucia, G. • Di Giorgio, A. M. • Dole, H. • Dubath, F. • Dupac, X. • Dusini, S. • Ealet, A. • Farina, M. • Farinelli, R. • Farrens, S. • Faustini, F. • Ferriol, S. • Finelli, F. • Fotopoulou, S. • Fourmanoit, N. • Frailis, M. • Franceschi, E. • Fumana, M. • Galeotta, S. • Gillis, B. • Giocoli, C. • Gracia-Carpio, J. • Grazian, A. • Grupp, F. • Haugan, S. V. H. • Holmes, W. • Hormuth, F. • Hornstrup, A. • Hudelot, P. • Jahnke, K. • Jhabvala, M. • Joachimi, B. • Keihänen, E. • Kermiche, S. • Kiessling, A. • Kilbinger, M. • Kubik, B. • Kunz, M. • Kurki-Suonio, H. • Lahav, O. • Le Brun, A. M. C. • Ligori, S. • Lilje, P. B. • Lindholm, V. • Lloro, I. • Mainetti, G. • Maino, D. • Maiorano, E. • Mansutti, O. • Marcin, S. • Marggraf, O. • Markovic, K. • Martinelli, M. • Martinet, N. • Marulli, F. • Massey, R. • Maurogordato, S. • Medinaceli, E. • Mei, S. • Melchior, M. • Mellier, Y. • Meneghetti, M. • Merlin, E. • Meylan, G. • Mora, A. • Moresco, M. • Morin, B. • Moscardini, L. • Munari, E. • Nakajima, R. • Neissner, C. • Nichol, R. C. • Niemi, S.-M. • Padilla, C. • Paltani, S. • Pasian, F. • Pedersen, K. • Percival, W. J. • Pettorino, V. • Pires, S. • Polenta, G. • Poncet, M. • Popa, L. A. • Pozzetti, L. • Raison, F. • Rebolo, R. • Rhodes, J. • Riccio, G. • Romelli, E. • Roncarelli, M. • Saglia, R. • Sakr, Z. • Sapone, D. • Sartoris, B. • Schewtschenko, J. A. • Schneider, P. • Schrabback, T. • Secroun, A. • Sefusatti, E. • Seidel, G. • Serrano, S. • Simon, P. • Sirignano, C. • Sirri, G. • Spurio Mancini, A. • Stanco, L. • Starck, J.-L. • Steinwagner, J. • Tallada-Crespí, P. • Tavagnacco, D. • Taylor, A. N. • Tereno, I. • Toft, S. • Toledo-Moreo, R. • Torradeflot, F. • Valiviita, J. • Vassallo, T. • Verdoes Kleijn, G. • Veropalumbo, A. • Wang, Y. • Weller, J. • Zamorani, G. • Zerbi, F. M. • Zucca, E. • Bolzonella, M. • Burigana, C. • Calabrese, M. • Di Ferdinando, D. • Escartin Vigo, J. A. • Gabarra, L. • Matthew, S. • Mauri, N. • Pezzotta, A. • Pöntinen, M. • Porciani, C. • Scottez, V. • Tenti, M. • Viel, M. • Wiesmann, M. • Akrami, Y. • Allevato, V. • Andika, I. T. • Archidiacono, M. • Atrio-Barandela, F. • Balaguera-Antolinez, A. • Ballardini, M. • Bertacca, D. • Bethermin, M. • Blanchard, A. • Blot, L. • Böhringer, H. • Borgani, S. • Brown, M. L. • Bruton, S. • Cabanac, R. • Calabro, A. • Camacho Quevedo, B. • Cappi, A. • Caro, F. • Carvalho, C. S. • Castro, T. • Cogato, F. • Contarini, S. • Contini, T. • Cooray, A. R. • Davini, S. • De Paolis, F. • Desprez, G. • Díaz-Sánchez, A. • Di Domizio, S. • Diego, J. M. • Ferrari, A. G. • Ferreira, P. G. • Finoguenov, A. • Ganga, K. • García-Bellido, J. • Gasparetto, T. • Gaztanaga, E. • Giacomini, F. • Gianotti, F. • Gozaliasl, G. • Gregorio, A. • Guidi, M. • Gutierrez, C. M. • Hall, A. • Hemmati, S. • Hildebrandt, H. • Hjorth, J. • Kajava, J. J. E. • Kang, Y. • Kansal, V. • Karagiannis, D. • Kirkpatrick, C. C. • Kruk, S. • Lattanzi, M. • Lembo, M. • Leroy, G. • Lesgourgues, J. • Liaudat, T. I. • Liu, S. J. • Loureiro, A. • Maggio, G. • Magliocchetti, M. • Mannucci, F. • Maoli, R. • Martín-Fleitas, J. • Martins, C. J. A. P. • Maurin, L. • Metcalf, R. B. • Miluzio, M. • Monaco, P. • Moretti, C. • Murray, C. • Nadathur, S. • Naidoo, K. • Navarro-Alsina, A. • Nesseris, S. • Paterson, K. • Pisani, A. • Potter, D. • Risso, I. • Rocci, P.-F. • Sahlén, M. • Sarpa, E. • Schneider, A. • Sciotti, D. • Sellentin, E. • Sereno, M. • Silvestri, A. • Smith, L. C. • Tanidis, K. • Tao, C. • Testera, G. • Teyssier, R. • Tosi, S. • Troja, A. • Tucci, M. • Valieri, C. • Venhola, A. • Vergani, D. • Vernizzi, F. • Verza, G. • Vielzeuf, P. • Walton, N. A.

Abstract • With about 1.5 billion galaxies expected to be observed, the very large number of objects in the Euclid photometric survey will allow for precise studies of galaxy clustering from a single survey, over a large range of redshifts, 0.2 < z < 2.5. In this work, we use photometric redshifts zph to extract the baryon acoustic oscillation signal (BAO) from the Flagship galaxy mock catalogue with a tomographic approach to constrain the evolution of the Universe and infer its cosmological parameters. We measured the two-point angular correlation function in 13 redshift bins. A template-fitting approach was applied to the measurement to extract the shift of the BAO peak through the transverse Alcock--Paczynski parameter α. A joint analysis of all redshift bins was performed to constrain α at the effective redshift zeff = 0.77 with Markov chain Monte Carlo and profile likelihood techniques. We also extracted one αi parameter per redshift bin to quantify its evolution as a function of time. From these 13 αi, which are directly proportional to the ratio DA/rd, we constrain the product of the reduced Hubble constant and the sound horizon at the drag epoch, h rd, and the matter density parameter Ωm. From the joint analysis, we constrain DA/rd = 10.764-0.084+0.0839 D A / r d = 10 . 764 - 0.0849 + 0.0839 at the 68% confidence level, which represents a three-fold improvement over current constraints from the Dark Energy Survey. As expected, the constraining power in the analysis of each redshift bin is lower, with an uncertainty ranging from ±1.23 to ±0.289. From these results, we constrain Ωm = 0.296-0.059+0.074 Ω m = 0 . 296 - 0.059 + 0.074 and h rd = 99.35-4.55+4.29 Mpc h r d = 99 . 35 - 4.55 + 4.29 Mpc . We quantify the influence of analysis choices such as the template, scale cuts, and redshift bins, and systematic effects such as redshift-space distortions, over our constraints, both at the level of the extracted αi parameters and at the level of cosmological inference.

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24633-avatar

Shoubaneh Hemmati

Staff Scientist


24660-avatar

Yun Wang

Staff Scientist