Catalog and Image Atlas of 94 Polar-Structure Galaxy Candidates from Euclid Quick Data Release 1

This dataset accompanies the Astronomy & Astrophysics Letter "Polar-structure galaxies beyond the local Universe: first results from Euclid" by Guerrette et al. We present a sample of 94 visually identified candidate polar-structure galaxies (PSGs) selected from the Euclid Quick Release 1 (Q1) imaging data. These objects represent our highest-confidence PSG candidates, exhibiting prominent structures that are strongly misaligned with the main bodies of their host galaxies. The classifications are based on projected morphology and have not been kinematically confirmed. The dataset contains: Euclid_Q1_BEST_Catalog.csv: A machine-readable catalog containing galaxy identifiers, coordinates, morphological classifications, and associated photometric and structural properties. BEST_FITS_Cutouts.zip: VIS-band FITS cutouts of all 94 galaxies, extracted from the Euclid Q1 imaging mosaics. Euclid_Q1_BEST_PSGs_Atlas.pdf: A visual atlas containing enhanced outer structure images, enhanced outer structure images with isophotal contours, and enhanced inner structure images for each galaxy. README.txt: General documentation describing the dataset and its contents. Euclid_Q1_BEST_Catalog_README.txt: Definitions and units for the catalog columns. The image enhancements and isophote maps were generated to facilitate the identification and examination of polar structures. Further details on the candidate selection, image-processing methods, and analysis are provided in the accompanying Letter. Original data credit: ESA Euclid/Euclid Consortium/NASA/Q1-2025.