Euclid Quick Data Release (Q1)

Astronomy and Astrophysics 2026 Open access

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Authors: Mike Walmsley, L. Quilley, Karen L. Masters, Sandor Kruk, K. A. Remmelgas, Jürgen Popp, E. Romelli, David O’Ryan, H. J. Dickinson, Chris Lintott, S. Serjeant, Rebecca Smethurst
+88 more Brooke Simmons, Jason Shingirai Makechemu, Izzy L. Garland, H. L. Roberts, Kameswara Bharadwaj Mantha, L. Fortson, Tobias Géron, William C. Keel, E. M. Baeten, C. Macmillan, Jo Bovy, Santiago Casas, C. De Leo, H. Domínguez Sánchez, J. Katona, J. H. Knapen, András Kovács, N. Aghanim, B. Altieri, A. Amara, S. Andreon, N. Auricchio, H. Aussel, C. Baccigalupi, Marco Baldi, A. Balestra, S. Bardelli, A. Basset, P Battaglia, R. Bender, A. Biviano, Andrea Bonchi, E. Branchini, M. Brescia, J. Brinchmann, S. Camera, G Cañas-Herrera, V. Capobianco, C. Carbone, J. Carretero, F. J. Castander, M. Castellano, G. Castignani, S. Cavuoti, K. C. Chambers, A Cimatti, C. Colodro-Conde, G. Congedo, Christopher J. Conselice, L. Conversi, Y. Copin, F. Courbin, H. M. Courtois, M. Cropper, A. Da Silva, H. Degaudenzi, G. De Lucia, A. M. Di Giorgio, C. Dolding, H. Dole, F. Dubath, C. A. J. Duncan, X. Dupac, S. Dusini, A. Ealet, S. Escoffier, Maximilian Fabricius, M. Farina, R. Farinelli, F Faustini, F. Finelli⋆, P. Fosalba, S. Fotopoulou, M. Frailis, E. Franceschi, S. Galeotta, Koshy George, B. Gillis, C. Giocoli, P. Gómez-Álvarez, J Gracia-Carpio, B. R. Granett, A. Grazian, F. Grupp, Stephen Gwyn, S. V. H. Haugan, Henk Hoekstra, W. Holmes
DOI: 10.1051/0004-6361/202555140
Cited by: 7
References: 71

Abstract

We present a detailed visual morphology catalogue for the Euclid Quick Release 1 (Q1). Our catalogue includes galaxy features such as bars, spiral arms, and ongoing mergers, for the 378 000 bright ( I E < 20.5) or extended (area ≥700 pixels) galaxies in Q1. The catalogue was created by finetuning the Zoobot galaxy foundation models on annotations from an intensive one-month campaign by Galaxy Zoo volunteers. Our measurements are fully automated, and hence fully scaleable. This catalogue is the first 0.4% of the approximately 100 million galaxies where Euclid will ultimately resolve detailed morphology.

Fields of Study & Subjects

Galaxies: Formation Evolution Phenomena Astronomy and Astrophysical Research Space Technology and Applications

Publication details

Journal / source
Astronomy and Astrophysics
Publisher
EDP Sciences
Volume
711
Pages
A9–A9
Publication date
30 June 2026
Language
EN