Euclid (Q1). Census of dwarf galaxies

This catalogue was then visually classified to produce a final sample of dwarf candidates, including their morphology, number of nuclei, globular cluster (GC) richness, and presence of a blue compact centre. We identified 2674 dwarf candidates, corresponding to 188 dwarfs per square degree. The visual classification of the dwarfs reveals a slightly uneven morphological mix of 58% ellipticals and 42% irregulars, with very few potentially GC-rich (1.0%) and nucleated (4.0%) candidates but a noticeable fraction (6.9%) of dwarfs with blue compact centres.

The distance distribution of 388 (15%) of the dwarf candidates with spectroscopic redshifts peaks at about 400Mpc. Their stellar mass distribution confirms our selection effectively identifies dwarfs while minimising contamination. The most prominent dwarf overdensities are dominated by dEs, while dIs are more evenly distributed across the field of view.

This work highlights Euclid's remarkable ability to detect and characterise dwarf galaxies across diverse masses, distances, and environments. Description: Table A.1 lists the entire sample of dwarf galaxy candidates with their morphological and visual properties, ordered by increasing RA. Table A.2 lists the Photometric and structural properties of the dwarf galaxy candidates ordered by increasing RA.

Table A.3. lists the aperture magnitudes and extinction corrections (EC) of the dwarf galaxy candidates for the Euclid I_E, Y_E, J_E and H_E photometric bands. The dwarf galaxy candidates are ordered by increasing RA or equivalently Euclid ID. Table A.4. lists the stellar mass estimates obtained via the reference SED fitting setup and all available photometric bands assuming z=0.1 or z=0.05 respectively.

The dwarf galaxy candidates are ordered by increasing RA or equivalently Euclid ID. Table A.5. lists the stellar mass estimates obtained via the reference SED fitting setup and all available photometric bands for dwarf galaxy candidates with spectroscopic redshifts available. The dwarf galaxy candidates are ordered by increasing RA or equivalently Euclid ID.