Euclid Quick Data Release (Q1): IX. First visual morphology catalogue

Authors

• Mike Walmsley
• Marc Huertas-Company
• L. Quilley
• Karen Masters, Haverford CollegeFollow

Document Type

Journal Article

Role

Author

Published In

Astronomy & Astrophysics

Volume

711

Article Number

A9

Publication Date

6-30-2026

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.

Suggested Citation

Walmsley, M., Huertas-Company, M., Quilley, L., Masters, Karen L. (Physics & Astronomy), et al. (2026). Euclid Quick Data Release (Q1)—IX. First visual morphology catalogue. Astronomy & Astrophysics, 711, A9. https://doi.org/10.1051/0004-6361/202555140