Euclid Quick Data Release (Q1) -- Data release overview
Abstract
The first Euclid Quick Data Release, Q1, comprises 63.1 sq deg of the Euclid Deep Fields (EDFs) to nominal wide-survey depth. It encompasses visible and near-infrared space-based imaging and spectroscopic data, ground-based photometry in the u, g, r, i and z bands, as well as corresponding masks. Overall, Q1 contains about 30 million objects in three areas near the ecliptic poles around the EDF-North and EDF-South, as well as the EDF-Fornax field in the constellation of the same name. The purpose of this data release -- and its associated technical papers -- is twofold. First, it is meant to inform the community of the enormous potential of the Euclid survey data, to describe what is contained in these data, and to help prepare expectations for the forthcoming first major data release DR1. Second, it enables a wide range of initial scientific projects with wide-survey Euclid data, ranging from the early Universe to the Solar System. The Q1 data were processed with early versions of the processing pipelines, which already demonstrate good performance, with numerous improvements in implementation compared to pre-launch development. In this paper, we describe the sky areas released in Q1, the observations, a top-level view of the data processing of Euclid and associated external data, the Q1 photometric masks, and how to access the data. We also give an overview of initial scientific results obtained using the Q1 data set by Euclid Consortium scientists, and conclude with important caveats when using the data. As a complementary product, Q1 also contains observations of a star-forming area in Lynd's Dark Nebula 1641 in the Orion~A Cloud, observed for technical purposes during Euclid's performance-verification phase. This is a unique target, of a type not commonly found in Euclid's nominal sky survey.
Keywords
Cite
@article{arxiv.2503.15302,
title = {Euclid Quick Data Release (Q1) -- Data release overview},
author = {Euclid Collaboration and H. Aussel and I. Tereno and M. Schirmer and G. Alguero and B. Altieri and E. Balbinot and T. de Boer and P. Casenove and P. Corcho-Caballero and H. Furusawa and J. Furusawa and M. J. Hudson and K. Jahnke and G. Libet and J. Macias-Perez and N. Masoumzadeh and J. J. Mohr and J. Odier and D. Scott and T. Vassallo and G. Verdoes Kleijn and A. Zacchei and N. Aghanim and A. Amara and S. Andreon and N. Auricchio and S. Awan and R. Azzollini and C. Baccigalupi and M. Baldi and A. Balestra and S. Bardelli and A. Basset and P. Battaglia and A. N. Belikov and R. Bender and A. Biviano and A. Bonchi and D. Bonino and E. Branchini and M. Brescia and J. Brinchmann and S. Camera and G. Cañas-Herrera and V. Capobianco and C. Carbone and V. F. Cardone and J. Carretero and S. Casas and F. J. Castander and M. Castellano and G. Castignani and S. Cavuoti and K. C. Chambers and A. Cimatti and C. Colodro-Conde and G. Congedo and C. J. Conselice and L. Conversi and Y. Copin and F. Courbin and H. M. Courtois and M. Cropper and J. -G. Cuby and A. Da Silva and R. da Silva and H. Degaudenzi and J. T. A. de Jong and G. De Lucia and A. M. Di Giorgio and J. Dinis and C. Dolding and H. Dole and M. Douspis and F. Dubath and C. A. J. Duncan and X. Dupac and S. Dusini and A. Ealet and S. Escoffier and M. Fabricius and M. Farina and R. Farinelli and F. Faustini and S. Ferriol and S. Fotopoulou and N. Fourmanoit and M. Frailis and E. Franceschi and P. Franzetti and S. Galeotta and K. George and W. Gillard and B. Gillis and C. Giocoli and P. Gómez-Alvarez and J. Gracia-Carpio and B. R. Granett and A. Grazian and F. Grupp and L. Guzzo and S. Gwyn and S. V. H. Haugan and O. Herent and J. Hoar and H. Hoekstra and M. S. Holliman and W. Holmes and I. M. Hook and F. Hormuth and A. Hornstrup and P. Hudelot and S. Ilić and M. Jhabvala and B. Joachimi and E. Keihänen and S. Kermiche and A. Kiessling and B. Kubik and K. Kuijken and M. Kümmel and M. Kunz and H. Kurki-Suonio and O. Lahav and Q. Le Boulc'h and A. M. C. Le Brun and D. Le Mignant and P. Liebing and S. Ligori and P. B. Lilje and V. Lindholm and I. Lloro and G. Mainetti and D. Maino and E. Maiorano and O. Mansutti and S. Marcin and O. Marggraf and K. Markovic and M. Martinelli and N. Martinet and F. Marulli and R. Massey and S. Maurogordato and H. J. McCracken and E. Medinaceli and S. Mei and M. Melchior and Y. Mellier and M. Meneghetti and E. Merlin and G. Meylan and A. Mora and M. Moresco and P. W. Morris and L. Moscardini and S. Mourre and R. Nakajima and C. Neissner and R. C. Nichol and S. -M. Niemi and J. W. Nightingale and T. Nutma and C. Padilla and S. Paltani and F. Pasian and J. A. Peacock and K. Pedersen and W. J. Percival and V. Pettorino and S. Pires and G. Polenta and J. E. Pollack and M. Poncet and L. A. Popa and L. Pozzetti and G. D. Racca and F. Raison and R. Rebolo and A. Renzi and J. Rhodes and G. Riccio and H. -W. Rix and E. Romelli and M. Roncarelli and E. Rossetti and B. Rusholme and R. Saglia and Z. Sakr and A. G. Sánchez and D. Sapone and B. Sartoris and M. Sauvage and J. A. Schewtschenko and P. Schneider and M. Scodeggio and A. Secroun and E. Sefusatti and G. Seidel and M. Seiffert and S. Serrano and P. Simon and C. Sirignano and G. Sirri and J. Skottfelt and A. Spurio Mancini and L. Stanco and J. Steinwagner and C. Surace and P. Tallada-Crespí and D. Tavagnacco and A. N. Taylor and H. I. Teplitz and N. Tessore and S. Toft and R. Toledo-Moreo and F. Torradeflot and A. Tsyganov and I. Tutusaus and E. A. Valentijn and L. Valenziano and J. Valiviita and A. Veropalumbo and Y. Wang and J. Weller and O. R. Williams and G. Zamorani and F. M. Zerbi and E. Zucca and V. Allevato and M. Ballardini and R. P. Blake and M. Bolzonella and E. Bozzo and C. Burigana and R. Cabanac and M. Calabrese and A. Cappi and D. Di Ferdinando and J. A. Escartin Vigo and L. Gabarra and W. G. Hartley and M. Huertas-Company and J. Martín-Fleitas and S. Matthew and M. Maturi and N. Mauri and R. B. Metcalf and A. Pezzotta and M. Pöntinen and C. Porciani and I. Risso and V. Scottez and M. Sereno and M. Tenti and M. Viel and M. Wiesmann and Y. Akrami and S. Alvi and I. T. Andika and S. Anselmi and M. Archidiacono and F. Atrio-Barandela and S. Avila and P. Bergamini and D. Bertacca and M. Bethermin and L. Bisigello and A. Blanchard and L. Blot and H. Böhringer and S. Borgani and A. S. Borlaff and M. L. Brown and S. Bruton and F. Buitrago and A. Calabro and G. Calderone and B. Camacho Quevedo and F. Caro and C. S. Carvalho and T. Castro and Y. Charles and F. Cogato and S. Conseil and A. R. Cooray and M. Costanzi and O. Cucciati and S. Davini and F. De Paolis and G. Desprez and A. Díaz-Sánchez and J. J. Diaz and S. Di Domizio and J. M. Diego and P. Dimauro and P. -A. Duc and A. Enia and Y. Fang and A. M. N. Ferguson and A. G. Ferrari and A. Finoguenov and A. Fontana and F. Fontanot and A. Franco and J. García-Bellido and T. Gasparetto and R. Gavazzi and E. Gaztanaga and F. Giacomini and F. Gianotti and A. H. Gonzalez and G. Gozaliasl and A. Gruppuso and M. Guidi and C. M. Gutierrez and A. Hall and C. Hernández-Monteagudo and H. Hildebrandt and J. Hjorth and J. Jacobson and S. Joudaki and J. J. E. Kajava and Y. Kang and V. Kansal and D. Karagiannis and K. Kiiveri and C. C. Kirkpatrick and S. Kruk and F. Lacasa and C. Laigle and M. Lattanzi and V. Le Brun and J. Le Graet and L. Legrand and M. Lembo and F. Lepori and G. Leroy and G. F. Lesci and J. Lesgourgues and L. Leuzzi and T. I. Liaudat and A. Loureiro and M. Magliocchetti and E. A. Magnier and C. Mancini and F. Mannucci and R. Maoli and C. J. A. P. Martins and L. Maurin and C. J. R. McPartland and J. -B. Melin and M. Migliaccio and M. Miluzio and P. Monaco and A. Montoro and C. Moretti and G. Morgante and C. Murray and S. Nadathur and K. Naidoo and A. Navarro-Alsina and S. Nesseris and L. Nicastro and M. Oguri and F. Passalacqua and K. Paterson and L. Patrizii and A. Pisani and D. Potter and S. Quai and M. Radovich and P. Reimberg and P. -F. Rocci and G. Rodighiero and R. P. Rollins and S. Sacquegna and M. Sahlén and D. B. Sanders and E. Sarpa and C. Scarlata and J. Schaye and A. Schneider and M. Schultheis and D. Sciotti and D. Scognamiglio and E. Sellentin and F. Shankar and L. C. Smith and E. Soubrie and S. A. Stanford and K. Tanidis and C. Tao and G. Testera and M. Tewes and R. Teyssier and S. Tosi and A. Troja and M. Tucci and C. Valieri and A. Venhola and D. Vergani and F. Vernizzi and G. Verza and P. Vielzeuf and N. A. Walton and J. R. Weaver and J. Wilde and L. Zalesky},
journal= {arXiv preprint arXiv:2503.15302},
year = {2025}
}
Comments
27 pages, 12 figures, data release at https://www.cosmos.esa.int/en/web/euclid/euclid-q1-data-release paper submitted to the special A&A issue