Iras-allsky

Euclid preparation: CXII. Baryon acoustic oscillations extraction techniques: comparison and optimisation

November 2026 • 2026A&A...715A..98E

Authors • Euclid Collaboration • Sarpa, E. • Veropalumbo, A. • Bonici, M. • Kärcher, M. • Crocce, M. • Sefusatti, E. • Maragliano, E. • Branchini, E. • Oliveri, C. • Gambardella, G. • Camacho Quevedo, B. • Moretti, C. • Monaco, P. • Bautista, J. • Viel, M. • Percival, W. J. • Nadathur, S. • Pezzotta, A. • Eggemeier, A. • Sánchez, A. G. • Bel, J. • Carbone, C. • Crespi, A. • Radinović, S. • Parimbelli, G. • Farina, A. • Risso, I. • Guidi, M. • Degni, G. • Eisenstein, D. • Beutler, F. • García-García, C. • Piccirilli, G. • Sorce, J. G. • Altieri, B. • Andreon, S. • Baccigalupi, C. • Baldi, M. • Bardelli, S. • Battaglia, P. • Biviano, A. • Brescia, M. • Camera, S. • Cañas-Herrera, G. • Capobianco, V. • Carretero, J. • Castander, F. J. • Castellano, M. • Castignani, G. • Cavuoti, S. • Chambers, K. C. • 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. • Dubath, F. • Dupac, X. • Escoffier, S. • Farina, M. • Farinelli, R. • Faustini, F. • Ferriol, S. • Finelli, F. • Fosalba, P. • Fourmanoit, N. • Frailis, M. • Franceschi, E. • Fumana, M. • Galeotta, S. • George, K. • Gillard, W. • Gillis, B. • Giocoli, C. • Gracia-Carpio, J. • Grazian, A. • Grupp, F. • Guzzo, L. • Haugan, S. V. H. • Holmes, W. • Hormuth, F. • Hornstrup, A. • Jahnke, K. • Jhabvala, M. • Joachimi, B. • Kermiche, S. • Kiessling, A. • Kubik, B. • Kümmel, M. • Kunz, M. • Kurki-Suonio, H. • Le Brun, A. M. C. • Ligori, S. • Lilje, P. B. • Lindholm, V. • Lloro, I. • Mainetti, G. • Mansutti, O. • Marggraf, O. • Martinelli, M. • Martinet, N. • Marulli, F. • Massey, R. J. • Medinaceli, E. • Mei, S. • Melchior, M. • Meneghetti, M. • Merlin, E. • Meylan, G. • Mora, A. • Moresco, M. • Moscardini, L. • Neissner, C. • Niemi, S.-M. • Padilla, C. • Paltani, S. • Pasian, F. • Pedersen, K. • Pettorino, V. • Pires, S. • Polenta, G. • Poncet, M. • Popa, L. A. • Raison, F. • Rhodes, J. • Riccio, G. • Rizzo, F. • Romelli, E. • Roncarelli, M. • Saglia, R. • Sakr, Z. • Sapone, D. • Schirmer, M. • Schneider, P. • Schrabback, T. • Scodeggio, M. • Secroun, A. • Sihvola, E. • Sirignano, C. • Sirri, G. • Stanco, L. • Tallada-Crespí, P. • Tavagnacco, D. • Taylor, A. N. • Tereno, I. • Tessore, N. • Toft, S. • Toledo-Moreo, R. • Torradeflot, F. • Tutusaus, I. • Valenziano, L. • Valiviita, J. • Vassallo, T. • Verdoes Kleijn, G. • Wang, Y. • Weller, J. • Zacchei, A. • Zamorani, G. • Zerbi, F. M. • Zucca, E. • Ballardini, M. • Boucaud, A. • Bozzo, E. • Burigana, C. • Cabanac, R. • Calabrese, M. • Cappi, A. • Castro, T. • Escartin Vigo, J. A. • Fabbian, G. • García-Bellido, J. • Macias-Perez, J. • Maoli, R. • Martín-Fleitas, J. • Mauri, N. • Metcalf, R. B. • Pöntinen, M. • Scottez, V. • Sereno, M. • Tenti, M. • Tucci, M. • Wiesmann, M. • Akrami, Y. • Andika, I. T. • Archidiacono, M. • Atrio-Barandela, F. • Aubourg, E. • Bazzanini, L. • Bertacca, D. • Bethermin, M. • Blanchard, A. • Blot, L. • Borgani, S. • Brown, M. L. • Bruton, S. • Calabro, A. • Caro, F. • Carvalho, C. S. • Cogato, F. • Contarini, S. • Cooray, A. R. • Cucciati, O. • Davini, S. • de Boer, T. • De Paolis, F. • Desprez, G. • Díaz-Sánchez, A. • Di Domizio, S. • Diego, J. M. • Duret, V. • Elkhashab, M. Y. • Fang, Y. • Ferreira, P. G. • Finoguenov, A. • Franco, A. • Ganga, K. • Gasparetto, T. • Gaztanaga, E. • Ghaffari, Z. • Giacomini, F. • Gianotti, F. • Gonzalez, E. J. • Gozaliasl, G. • Gruppuso, A. • Gutierrez, C. M. • Hall, A. • Hildebrandt, H. • Hjorth, J. • Kajava, J. J. E. • Kang, Y. • Kansal, V. • Karagiannis, D. • Kiiveri, K. • Kim, J. • Kirkpatrick, C. C. • Koyama, K. • Kruk, S. • Lam, M. C. • Leclercq, F. • Legrand, L. • Lembo, M. • Lepori, F. • Leroy, G. • Lesci, G. F. • Lesgourgues, J. • Liaudat, T. I. • Liu, S. J. • Magliocchetti, M. • Martins, C. J. A. P. • Maurin, L. • Migliaccio, M. • Miluzio, M. • Morgante, G. • Naidoo, K. • Navarro-Alsina, A. • Nesseris, S. • Pace, F. • Paoletti, D. • Paterson, K. • Patrizii, L. • Pattison, C. • Pisani, A. • Potter, D. • Pourtsidou, A. • Pratt, G. W. • Quai, S. • Radovich, M. • Rodighiero, G. • Roster, W. • Sacquegna, S. • Sahlén, M. • Sanders, D. B. • Schneider, A. • Sciotti, D. • Sellentin, E. • Smith, L. C. • Szapudi, I. • Tanidis, K. • Tao, C. • Tarsitano, F. • Testera, G. • Teyssier, R. • Tosi, S. • Troja, A. • Uhlemann, C. • Valieri, C. • Vernizzi, F. • Verza, G. • Vinciguerra, S. • von Wietersheim-Kramsta, M. • Walton, N. A. • Wright, A. H. • Yeung, H. W.

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, RECSYM and RECISO, 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 {Ωm, H0rs} 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 Ωm and ~3% on H0rs. The results from RECSYM and RECISO are consistent within the uncertainties, but we recommend RECSYM 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.

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Yun Wang

Staff Scientist