J/A+A/711/A10ivo://CDS.VizieR/J/A+A/711/A10CDSEuclid CollaborationMarleau F.R.Habas R.Carollo D.Tortora C.,Duc P.-A.Sola E.Saifollahi T.Fugenschuh M.Walmsley M.Zoller R.,Ferre-Mateu A.Cantiello M.Urbano M.Saremi E.Ragusa R.Laureijs R.,Hilker M.Muller O.Poulain M.Peletier R.F.Sprenger S.J.Marchal O.,Aghanim N.Altieri B.Amara A.Andreon S.Auricchio N.Aussel H.,Baccigalupi C.Baldi M.Balestra A.Bardelli S.Basset A.Battaglia P.,Bender R.Biviano A.Bonchi A.Bonino D.Branchini E.Brescia M.,Brinchmann J.Camera S.Canas-Herrera G.Capobianco V.Carbone C.,Carretero J.Casas S.Castellano M.Castignani G.Cavuoti S.,Chambers K.C.Cimatti A.Colodro-Conde C.Congedo G.Conselice C.J.,Conversi L.Copin Y.Corcione L.Courbin F.Courtois H.M.Cropper M.,Cuillandre J.-C.Da Silva A.Degaudenzi H.De Lucia G.Di Giorgio A.M.,Dolding C.Dole H.Dubath F.Dupac X.Dusini S.Escoffier S.,Fabricius M.Farina M.Faustini F.Ferriol S.Fosalba P.Fotopoulou S.,Frailis M.Franceschi E.Franzetti P.Fumana M.Galeotta S.George K.,Gillis B.Giocoli C.Granett B.R.Grazian A.Grupp F.Gwyn S.,Haugan S.V.H.Hoar J.Hoekstra H.Holmes W.Hormuth F.Hornstrup A.,Hudelot P.Jahnke K.Jhabvala M.Joachimi B.Keihanen E.Kermiche S.,Kiessling A.Kubik B.Kummel M.Kunz M.Kurki-Suonio H.Lahav O.,Le Boulc'h Q.Le Brun A.M.C.Le Mignant D.Ligori S.Lilje P.B.,Lindholm V.Lloro I.Mainetti G.Maino D.Maiorano E.Mansutti O.,Marcin S.Marggraf O.Martinelli M.Martinet N.Marulli F.Massey R.,Maurogordato S.McCracken H.J.Medinaceli E.Mei S.Melchior M.,Mellier Y.Meneghetti M.Merlin E.Meylan G.Mora A.Moresco M.,Moscardini L.Nakajima R.Neissner C.Niemi S.-M.Nightingale J.W.,Padilla C.Paltani S.Pasian F.Pedersen K.Percival W.J.Pettorino V.,Pires S.Polenta G.Poncet M.Popa L.A.Pozzetti L.Raison F.Rebolo R.,Renzi A.Rhodes J.Riccio G.Romelli E.Roncarelli M.Rossetti E.,Rusholme B.Saglia R.Sakr Z.Sanchez A.G.Sapone D.Sartoris B.,Sauvage M.Schewtschenko J.A.Schirmer M.Schneider P.Scodeggio M.,Secroun A.Seidel G.Seiffert M.Serrano S.Simon P.Sirignano C.,Sirri G.Skottfelt J.Stanco L.Steinwagner J.Tallada-Crespi P.,Tavagnacco D.Taylor A.N.Teplitz H.I.Tereno I.Toft S.Toledo-Moreo R.,Torradeflot F.Tutusaus I.Valenziano L.Valiviita J.Vassallo T.,Verdoes Kleijn G.Veropalumbo A.Wang Y.Weller J.Zacchei A.,Zamorani G.Zerbi F.M.Zucca E.Ballardini M.Bolzonella M.Burigana C.,Cabanac R.Cappi A.Di Ferdinando D.Escartin Vigo J.A.Gabarra L.,Huertas-Company M.Martin-Fleitas J.Matthew S.Mauri N.Metcalf R.B.,Pontinen M.Scottez V.Sereno M.Tenti M.Viel M.Wiesmann M.Akrami Y.,Andika I.T.Anselmi S.Archidiacono M.Atrio-Barandela F.Bertacca D.,Bethermin M.Blanchard A.Borgani S.Brown M.L.Bruton S.Buitrago F.,Calabro A.Camacho Quevedo B.Caro F.Carvalho C.S.Castro T.Cogato F.,Conseil S.Cooray A.R.Davini S.De Paolis F.Desprez G.Diaz-Sanchez A.,Di Domizio S.Diego J.M.Dimauro P.Enia A.Franco A.Ganga K.,Garcia-Bellido J.Gasparetto T.Gaztanaga E.Gianotti F.Gozaliasl G.,Guidi M.Gutierrez C.M.Hall A.Hernandez-Monteagudo C.Hildebrandt H.,Kajava J.J.E.Kang Y.Kansal V.Karagiannis D.Kiiveri K.,Kirkpatrick C.C.Kruk S.Legrand L.Lepori F.Leroy G.Lesci G.F.,Lesgourgues J.Liaudat T.I.Liu S.J.Macias-Perez J.Mannucci F.,Maoli R.Martins C.J.A.P.Maurin L.Miluzio M.Monaco P.Moretti C.,Morgante G.Navarro-Alsina A.Nicastro L.Paterson K.Patrizii L.,Potter D.Quai S.Radovich M.Rocci P.-F.Sacquegna S.Sahlen M.,Sanders D.B.Sarpa E.Schultheis M.Sciotti D.Sellentin E.Tanidis K.,Tao C.Testera G.Teyssier R.Tosi S.Troja A.Tucci M.Venhola A.,Vergani D.Verza G.Scott D.2026-06-30T15:23:54Z2026-06-30T16:23:08ZCDS support team

CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France

cds-question@unistra.frdwarf-galaxiesinfrared-photometrystellar-massesThe Euclid Q1 fields were selected for calibration purposes in cosmology and are therefore relatively devoid of nearby galaxies. However, this is precisely what makes them interesting fields in which to search for dwarf galaxies in local density environments. We take advantage of the unprecedented depth, spatial resolution, and field of view of the Euclid Quick Release (Q1) to build a census of dwarf galaxies in these regions. We have identified dwarf galaxies in a representative sample of 25 contiguous tiles in the Euclid Deep Field North (EDF-N), covering a total area of 14.25 square degrees. The dwarf galaxy candidates were identified using a semi-automatic detection method, based on properties measured by the Euclid pipeline and released as part of the catalogue produced by the MERge Processing Function (MER PF) pipeline. A selection cut in surface brightness and magnitude was used to produce an initial dwarf candidate catalogue, followed by a cut in morphology (removing background spirals) and I_E-H_E colour (removing red ellipticals). 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.2026A&A...711A..10Ehttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/711/A10CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/A+A/711/A10 : Euclid (Q1). Census of dwarf galaxies (Euclid Coll., 2026)J/A+A/711/A16 : X-ray point-like sources of Euclid (Q1) (Euclid Coll.+, 2026)J/A+A/711/A37 : Ultracool dwarfs in Euclid Deep Fields (Zerjal+, 2026)J/A+A/711/A38 : Euclid Q1. Photometric studies of known transientsJ/A+A/711/A39 : Euclid Q1. Secondary nuclei in ET galaxies (Fabricius+, 2026)J/A+A/711/A20 : Galaxies of Euclid (Q1) (Euclid Coll.+, 2026)J/A+A/711/A24 : Euclid Q1. Little red dots properties (Euclid Coll., 2026)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/711/A10https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/711/A10http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/711/A10https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/711/A10https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/711/A10http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/711/A10GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/711/A10/table1 (Entire dwarf galaxy candidates)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/711/A10/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/711/A10/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/711/A10/table1?GETtext/xml+votable180.050000true266.5542188965.246651110.005555555555555556Cone search capability for table J/A+A/711/A10/table2 (Photometric and structural properties of the dwarf galaxy candidates)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/711/A10/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/711/A10/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/711/A10/table2?GETtext/xml+votable180.050000true266.5542188965.246651110.005555555555555556Cone search capability for table J/A+A/711/A10/table4 (Stellar mass estimates assuming z=0.1 or z=0.05)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/711/A10/table4?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/711/A10/table4?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/711/A10/table4?GETtext/xml+votable180.050000true266.5542188965.246651110.005555555555555556Cone search capability for table J/A+A/711/A10/table5 (Stellar mass estimates with spectroscopic redshifts available)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/711/A10/table5?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/711/A10/table5?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/711/A10/table5?GETtext/xml+votable180.050000true266.8226819465.111501110.0055555555555555565/2559 4010 6/10231 11604-11605 11607 15355 15357-15359 16044 16046https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/711/A10?format=asciiInfrareddefaultJ/A+A/711/A10/table1Entire dwarf galaxy candidatesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintID? Euclid identifier of the objectmeta.id;meta.mainnullableRAJ2000Right ascension (J2000) of the dwarf galaxy candidatedegpos.eq.ra;meta.mainDEJ2000Declination (J2000) of the dwarf galaxy candidatedegpos.eq.dec;meta.mainMorphMorphological type of the dwarf galaxy candidatesrc.morph.typecharGC-richYes if dwarf galaxy candidate is GC-rich, No otherwisemeta.codecharNucleatedYes if dwarf galaxy candidate is nucleated, No otherwisemeta.codecharDisturbedYes if dwarf galaxy candidate has a disturbed Morphology, No otherwisemeta.codecharBlue-coredYes if dwarf galaxy candidate is blue-cored, No otherwisemeta.codecharJ/A+A/711/A10/table2Photometric and structural properties of the dwarf galaxy candidatesID? Euclid identifier of the objectmeta.id;meta.mainnullablerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRAJ2000Right ascension (J2000) of the dwarf galaxy candidatedegpos.eq.ra;meta.mainDEJ2000Declination (J2000) of the dwarf galaxy candidatedegpos.eq.dec;meta.mainIEmag? Magnitude in Euclid I_E bandmagphot.mag;em.optfloatnullablee_IEmag? Magnitude uncertainty in Euclid I_E bandmagstat.error;phot.magfloatnullableArea? Segmentation area of the dwarf galaxy candidatearcsec**2phys.areafloatnullableell? Ellipticity of the dwarf galaxy candidatesrc.ellipticityfloatnullablePA[]? Position angle of the dwarf galaxy candidatedegpos.posAngfloatnullableSB? Surface brightness of the dwarf galaxy candidatemag.arcsec**-2phot.mag.sbfloatnullablee_SB? Surface brightness uncertaintymag.arcsec**-2stat.errorfloatnullableJ/A+A/711/A10/table3Aperture magnitudes and extinction corrections (EC) of the dwarf galaxy candidatesEC(IE)Extinction correction for Euclid I_E bandmagphot.mag;arith.difffloatrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintIDEuclid identifier of the object (1)meta.id;meta.mainn_ID[*] Note (1)meta.notecharIEmagMagnitude in Euclid I_E bandmagphot.mag;em.optfloate_IEmagMagnitude uncertainty in Euclid I_E bandmagstat.error;phot.magfloate_EC(IE)Extinction correction uncertainty for Euclid I_E bandmagstat.errorfloatYEmag? Magnitude in Euclid Y_E bandmagphot.mag;em.IR.Jfloatnullablee_YEmagMagnitude uncertainty in Euclid Y_E bandmagstat.error;phot.magfloatEC(YE)Extinction correction for Euclid Y_E bandmagphot.mag;arith.difffloate_EC(YE)Extinction correction uncertainty for Euclid Y_E bandmagstat.errorfloatJEmag? Magnitude in Euclid J_E bandmagphot.mag;em.IR.Jfloatnullablee_JEmagMagnitude uncertainty in Euclid J_E bandmagstat.error;phot.magfloatEC(JE)Extinction correction for Euclid J_E bandmagphot.mag;arith.difffloate_EC(JE)Extinction correction uncertainty for Euclid J_E bandmagstat.errorfloatHEmag? Magnitude in Euclid H_E bandmagphot.mag;em.IR.Hfloatnullablee_HEmagMagnitude uncertainty in Euclid H_E bandmagstat.error;phot.magfloatEC(HE)Extinction correction for Euclid H_E bandmagphot.mag;arith.difffloate_EC(HE)Extinction correction uncertainty for Euclid H_E bandmagstat.errorfloatJ/A+A/711/A10/table4Stellar mass estimates assuming z=0.1 or z=0.05recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintIDEuclid identifier of the objectmeta.id;meta.mainRAJ2000Right ascension (J2000) of the dwarf galaxy candidatedegpos.eq.ra;meta.mainDEJ2000Declination (J2000) of the dwarf galaxy candidatedegpos.eq.dec;meta.mainlogM*z0.1Stellar mass estimate assuming z=0.1log(solMass)phys.massfloate_logM*z0.1Lower uncertainty bound for the stellar mass estimate assuming z=0.1log(solMass)stat.errorfloatE_logM*z0.1Upper uncertainty bound for the stellar mass estimate assuming z=0.1log(solMass)stat.error;stat.maxfloatlogM*z0.05Stellar mass estimate assuming z=0.05log(solMass)phys.massfloate_logM*z0.05Lower uncertainty bound for the stellar mass estimate assuming z=0.05log(solMass)stat.errorfloatE_logM*z0.05Upper uncertainty bound for the stellar mass estimate assuming z=0.05log(solMass)stat.error;stat.maxfloatJ/A+A/711/A10/table5Stellar mass estimates with spectroscopic redshifts availablerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintIDEuclid identifier of the objectmeta.id;meta.mainRAJ2000Right ascension (J2000) of the dwarf galaxy candidatedegpos.eq.ra;meta.mainDEJ2000Declination(J2000) of the dwarf galaxy candidatedegpos.eq.dec;meta.mainlogM*zspAllStellar mass estimate assuming z=z_spec using all bandslog(solMass)phys.massfloate_logM*zspAllLower uncertainty bound for the stellar mass estimate assuming z=z_spec using all bandslog(solMass)stat.errorfloatE_logM*zspAllUpper uncertainty bound for the stellar mass estimate assuming z=z_spec using all bandslog(solMass)stat.error;stat.maxfloatlogM*zspEStellar mass estimate assuming z=z_spec using only Euclid bandslog(solMass)phys.massfloate_logM*zspELower uncertainty bound for the stellar mass estimate assuming z=z_spec using only Euclid bandslog(solMass)stat.errorfloatE_logM*zspEUpper uncertainty bound for the stellar mass estimate assuming z=z_spec using only Euclid bandslog(solMass)stat.error;stat.maxfloatlogM*zspSBStellar mass estimate assuming z=z_spec using single burst model (all bands)log(solMass)phys.massfloate_logM*zspSBLower uncertainty bound for the stellar mass estimate assuming z=z_spec using single burst model (all bands)log(solMass)stat.errorfloatE_logM*zspSBUpper uncertainty bound for the stellar mass estimate assuming z=z_spec using single burst model (all bands)log(solMass)stat.error;stat.maxfloat