Euclid Q1 Papers

On 30th June 2026, Astronomy & Astrophysics published a special issue with 41 scientific papers using Euclid Q1 data.

The list also includes papers describing Euclid Q1 overview, data products and processing as well as scientific results. 

Overview, data products and processing:

Euclid Quick Data Release (Q1) - I. Data release overview
Euclid Collaboration: Aussel et al. (2026)

Euclid Quick Data Release (Q1) - II. VIS processing and data products
Euclid Collaboration: McCracken et al. (2026)

Euclid Quick Data Release (Q1) - III. NIR processing and data products
Euclid Collaboration: Polenta et al. (2026)

Euclid Quick Data Release (Q1) - IV. From images to multi-wavelength catalogues: The Euclid MERge processing function
Euclid Collaboration: Romelli et al. (2026)

Euclid Quick Data Release (Q1) - V. Photometric redshifts and physical properties of galaxies through the PHZ processing function
Euclid Collaboration: Tucci et al. (2026)

Euclid Quick Data Release (Q1) - VI. From spectrograms to spectra: The SIR spectroscopic processing function
Euclid Collaboration: Copin et al. (2026)

Euclid Quick Data Release (Q1) - VII. Characteristics and limitations of the spectroscopic measurements
Euclid Collaboration: Le Brun et al. (2026)

Scientific results using Euclid Q1 data

Euclid Quick Data Release (Q1) - VIII. Exploring galaxy morphology across cosmic time through Sérsic fits
Euclid Collaboration: Quilley et al. (2026)

Euclid Quick Data Release (Q1) - IX. First visual morphology catalogue
Euclid Collaboration: Walmsley et al. (2026)

Euclid Quick Data Release (Q1) - X. A census of dwarf galaxies across a range of distances and environments
Euclid Collaboration: Marleau et al. (2026)

Euclid Quick Data Release (Q1) - XI. A first look at the fraction of bars in massive galaxies at z < 1
Euclid Collaboration: Huertas-Company et al. (2026)

Euclid Quick Data Release (Q1) - XII. Quenching precedes bulge formation in dense environments but follows it in the field
Euclid Collaboration: Gentile et al. (2026)

Euclid Quick Data Release (Q1) - XIII. Exploring galaxy properties with a multi-modal foundation model
Euclid Collaboration: Siudek et al. (2026)

Euclid Quick Data Release (Q1) - XIV. A first view of the star-forming main sequence in the Euclid Deep Fields
Euclid Collaboration: Enia et al. (2026)

Euclid Quick Data Release (Q1) - XV. A probabilistic classification of quenched galaxies
Euclid Collaboration: Corcho-Caballero et al. (2026)

Euclid Quick Data Release (Q1) - XVI. Optical and near-infrared identification and classification of point-like X-ray selected sources
Euclid Collaboration: Roster et al. (2026)

Euclid Quick Data Release (Q1) - XVII. First Euclid statistical study of galaxy mergers and their connection to active galactic nuclei
Euclid Collaboration: La Marca et al. (2026)

Euclid Quick Data Release (Q1) - XVIII. First Euclid statistical study of the active galactic nuclei contribution fraction
Euclid Collaboration: Margalef-Bentabol et al. (2026)

Euclid Quick Data Release (Q1) - XIX. First study of red quasars selection
Euclid Collaboration: Tarsitano et al. (2026)

Euclid Quick Data Release (Q1) - XX. The active galaxies of Euclid
Euclid Collaboration: Matamoro Zatarain et al. (2026)

Euclid Quick Data Release (Q1) - XXI. Active galactic nuclei identification using diffusion-based inpainting of Euclid VIS images
Euclid Collaboration: Stevens et al. (2026)

Euclid Quick Data Release (Q1) - XXII. An investigation of optically faint, red objects in the Euclid Deep Fields
Euclid Collaboration: Girardi et al. (2026)

Euclid Quick Data Release (Q1) - XXIII. The average far-infrared properties of Euclid-selected star-forming galaxies
Euclid Collaboration: Hill et al. (2026)

Euclid Quick Data Release (Q1) - XXIV. Extending the quest for little red dots to z < 4
Euclid Collaboration: Bisigello et al. (2026)

Euclid Quick Data Release (Q1) - XXV. Hunting for luminous z > 6 galaxies in the Euclid Deep Fields – Forecasts and the first bright detections
Euclid Collaboration: Allen et al. (2026)

Euclid Quick Data Release (Q1) - XXVI. The Strong Lensing Discovery Engine A – System overview and first lens sample
Euclid Collaboration: Walmsley et al. (2026)

Euclid Quick Data Release (Q1) - XXVII. The Strong Lensing Discovery Engine B – Early strong lens candidates from visual inspection of high-velocity dispersion galaxies
Euclid Collaboration: Rojas et al. (2026)

Euclid Quick Data Release (Q1) - XXVIII. The Strong Lensing Discovery Engine C – Finding lenses with machine learning
Euclid Collaboration: Lines et al. (2026)

Euclid Quick Data Release (Q1) - XXIX. The strong-lensing discovery engine D: Double-source-plane lens candidates
Euclid Collaboration: Li et al. (2026)

Euclid Quick Data Release (Q1) - XXX. The Strong Lensing Discovery Engine E – Ensemble classification of strong gravitational lenses: lessons for Data Release 1
Euclid Collaboration: Holloway et al. (2026)

Euclid Quick Data Release (Q1) - XXXI. LEMON – LEns MOdelling with Neural networks. Automated and fast modelling of Euclid gravitational lenses with singular isothermal ellipsoid mass profile
Euclid Collaboration: Busillo et al. (2026)

Euclid Quick Data Release (Q1) - XXXII. From simulations to sky: Advancing machine-learning lens detection with real Euclid data
Euclid Collaboration: Lines et al. (2026)

Euclid Quick Data Release (Q1) - XXXIII. The first catalogue of strong-lensing galaxy clusters
Euclid Collaboration: Bergamini et al. (2026)

Euclid Quick Data Release (Q1) - XXXIV. First detections from the Euclid galaxy cluster workflow
Euclid Collaboration, Bhargava et al. (2026)

Euclid Quick Data Release (Q1) - XXXV. The role of cosmic connectivity in shaping galaxy clusters
Euclid Collaboration, Gouin et al. (2026)

Euclid Quick Data Release (Q1) - XXXVI. Galaxy shapes and alignments in the cosmic web
Euclid Collaboration, Laigle et al. (2026)

Euclid: Quick Data Release (Q1) – A photometric search for ultracool dwarfs in the Euclid Deep Fields
Euclid Collaboration, Žerjal et al. (2026)

Euclid: Quick Data Release (Q1) – Photometric studies of known transients
Duffy et al. (2026)

Euclid: Quick Data Release (Q1) – Secondary nuclei in early-type galaxies
Fabricius et al. (2026)

Euclid: Quick Data Release (Q1) – The connection between galaxy close encounters and radio activity
Magliocchetti et al. (2026)

Euclid: Quick Data Release (Q1) – Watching ICM-selected galaxy clusters with Euclid eyes: Prospects of Euclid data in the context of large SZE- and X-ray-based surveys
Klein et al. (2026)