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Lookup NU author(s): Dr Vicky FawcettORCiD
This work is licensed under a Creative Commons Attribution 4.0 International License (CC BY 4.0).
© 2026. The Author(s). Published by the American Astronomical Society.In 2021 May the Dark Energy Spectroscopic Instrument (DESI) collaboration began a 5 yr spectroscopic redshift survey to produce a detailed map of the evolving three-dimensional structure of the Universe between z = 0 and z ≈ 4. DESI’s principal scientific objectives are to place precise constraints on the equation of state of dark energy, the gravitationally driven growth of large-scale structure, and the sum of the neutrino masses, and to explore the observational signatures of primordial inflation. We present DESI DR1, which consists of all data acquired during the first 13 months of the DESI main survey, as well as a uniform reprocessing of the DESI Survey Validation data, which were previously made public in the DESI Early Data Release. The DR1 main survey includes high-confidence redshifts for 18.7M objects, of which 13.1M are spectroscopically classified as galaxies, 1.6M as quasars, and 4M as stars, making DR1 the largest sample of extragalactic redshifts ever assembled. We summarize the DR1 observations, the spectroscopic data-reduction pipeline and data products, large-scale structure catalogs, value-added catalogs, and describe how to access and interact with the data. In addition to fulfilling its core cosmological objectives with unprecedented precision, we expect DR1 to enable a wide range of transformational astrophysical studies and discoveries.
Author(s): Karim MA, Adame AG, Aguado D, Aguilar J, Ahlen S, Alam S, Aldering G, Zou H, Alexander DM, Alfarsy R, Allen L, Allende Prieto C, Alves O, Anand A, Andrade U, Armengaud E, Avila S, Aviles A, Awan H, Bailey S, Lizancos AB, Ballester O, Bault A, Bautista J, Bean R, Behera J, BenZvi S, Beraldo e Silva L, Bermejo-Climent JR, Beutler F, Bianchi D, Blake C, Blum R, Bolton AS, Bonici M, Brieden S, Brodzeller A, Brooks D, Buckley-Geer E, Burtin E, Bystrom A, Canning R, Carnero Rosell A, Carr A, Carrilho P, Casas L, Castander FJ, Cereskaite R, Cervantes-Cota JL, Chaussidon E, Chaves-Montero J, Chen S, Chen X, Circosta C, Claybaugh T, Cole S, Cooper AP, Cousinou M-C, Cuceu A, Davis TM, Dawson KS, de Belsunce R, de la Cruz R, de la Macorra A, de Mattia A, Deiosso N, Della Costa J, Demina R, Demirbozan U, DeRose J, Dey A, Dey B, Ding J, Ding Z, Doel P, Douglass K, Dowicz M, Ebina H, Edelstein J, Eisenstein DJ, Elbers W, Emas N, Escoffier S, Fagrelius P, Fan X, Fanning K, Favole G, Fawcett VA, Fernandez-Garcia E, Ferraro S, Findlay N, Font-Ribera A, Forero-Romero JE, Forero-Sanchez D, Frenk CS, Gansicke BT, Galbany L, Garcia-Bellido J, Garcia-Quintero C, Garrison LH, Gaztanaga E, Gil-Marin H, Gloudemans A, Gnedin OY, Gontcho A Gontcho S, Gonzalez D, Gonzalez-Morales AX, Gonzalez-Perez V, Gordon C, Graur O, Green D, Gruen D, Gsponer R, Guandalin C, Gutierrez G, Guy J, Hahn C, Han JJ, Han JJ, He S, Herrera-Alcantar HK, Heydenreich S, Honscheid K, Hou J, Howlett C, Huterer D, Irsic V, Ishak M, Jacques A, Jiang L, Jimenez J, Jing YP, Joachimi B, Joudaki S, Joyce R, Jullo E, Juneau S, Karacayli NG, Karim T, Kehoe R, Kent S, Khederlarian A, Kirkby D, Kisner T, Kitaura F-S, Kizhuprakkat N, Kong H, Koposov SE, Kremin A, Krolewski A, Lahav O, Lai Y, Lamman C, Lan T-W, Landriau M, Lang D, Lange JU, Lasker J, Le Goff J, Le Guillou L, Leauthaud A, Levi ME, Li S, Li TS, Liu W, Lodha K, Lokken M, Luo Y, Luo Y, Magneville C, Manera M, Manser CJ, Margala D, Martini P, Maus M, McCullough J, McDonald P, Medina GE, Medina-Varela L, Meisner A, Mena-Fernandez J, Menegas A, Meneses-Rizo J, Mezcua M, Miquel R, Montero-Camacho P, Moon J, Moustakas J, Munoz-Gutierrez A, Santos DM, Myers AD, Myles J, Nadathur S, Najita J, Napolitano L, Newman JA, Nikakhtar F, Nikutta R, Niz G, Noriega HE, Nugent P, Padmanabhan N, Paillas E, Palanque-Delabrouille N, Palmese A, Pan J, Pan Z, Parkinson D, Peacock JA, Ibanez MP, Percival WJ, Perez-Fernandez A, Perez-Rafols I, Peterson P, Piat J, Pieri MM, Pinon M, Poppett C, Porredon A, Prada F, Pucha R, Qin F, Rabinowitz D, Raichoor A, Ramirez-Perez C, Ramirez-Solano S, Rashkovetskyi M, Ravoux C, Guachalla BR, Riley AH, Rocher A, Rockosi C, Rohlf J, Rosado-Marin AJ, Ross AJ, Ross C, Rossi G, Ruggeri R, Ruhlmann-Kleider V, Sabiu CG, Said K, Sailer N, Saintonge A, Hernandez YS, Samushia L, Sanchez E, Sanders N, Sandford N, Satyavolu S, Saulder C, Saydjari AK, Schlafly EF, Schlegel D, Scholte D, Schubnell M, Semenaite A, Seo H, Shafieloo A, Sharples R, Silber J, Sinigaglia F, Siudek M, Slepian Z, Smith A, Soumagnac M, Sprayberry D, Perez JS, Swanson J, Tan T, Tarle G, Taylor P, Thomas G, Tojeiro R, Turner RJ, Turner W, Urena-Lopez LA, Vaisakh R, Valluri M, Valogiannis G, Vargas-Magana M, Verde L, Vielzeuf P, Walther M, Wang B, Wang MS, Wang B, Weaver BA, Weaverdyck N, Wechsler RH, Weinberg DH, White M, Whitford A, Wolfson M, Yang J, Yeche C, Youles S, Yu J, Yuan S, Zaborowski EA, Zarrouk P, Zhang H, Zhao C, Zhao R, Zheng Z, Zhou C, Zhou R, Zhou C, Zou H, Zu Y
Publication type: Article
Publication status: Published
Journal: Astronomical Journal
Year: 2026
Volume: 171
Issue: 5
Online publication date: 13/04/2026
Acceptance date: 27/02/2026
Date deposited: 28/04/2026
ISSN (print): 0004-6256
ISSN (electronic): 1538-3881
Publisher: American Astronomical Society
URL: https://doi.org/10.3847/1538-3881/ae4c43
DOI: 10.3847/1538-3881/ae4c43
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