2026-06-28T11:35:24Zivo://CDS.VizieR/J/A+A/707/A2392026-04-02T06:28:33ZJ.A_AIVOADiscovery of bright z~=7 LBGs in Euclid COSMOSWe present a search for z ~= 7 Lyman-break galaxies using the 1.72 deg^2^ near-infrared UltraVISTA survey in the COSMOS field, reaching 5 {sigma} depths in Y of 26.2. We incorporate deep Euclid optical and Euclid + Spitzer NIR imaging for a full spectral energy distribution (SED) fitting analysis. We find 289 candidate galaxies at 6.5 <= z <= 7.5 covering -22.6 <= MUV <= -20.2, faint enough to overlap with Hubble Space Telescope studies. We conduct a separate selection by including complementary Euclid performance verification imaging (reaching 5 {sigma} depths of 26.3), yielding 140 galaxies in 0.65 deg^2^, with 38 sources unique to this sample. We compute the rest-frame UV luminosity function (UV LF) from our samples, extending below the knee (M*=-21.14). We find that the shape of the UV LF is consistent with both a Schechter function and double-power law (DPL) at the magnitudes probed by this sample, with a DPL preferred at MUV < -22.5 when bright-end results are included. The UltraVISTA+Euclid sample provides a clean measurement of the LF due to the overlapping near-infrared filters identifying molecular absorption features in the SEDs of ultra-cool dwarf interlopers, and a dditional faint galaxies are recovered. A comparison with JWST LFs at z > 7 suggests a gentle evolution in the bright-end slope, although this is limited by a lack of robust bright-end measurements at z > 9. We forecast that in the Euclid Deep Fields, the removal of contaminant ultra-cool dwarfs as point sources will be possible at JE < 24.5. Finally, we present a high-equivalent-width Lyman-{alpha} emitter candidate identified by combining HSC, VISTA, and Euclid broadband photometry, highlighting the synergistic power t hese instruments will have in the Euclid Auxiliary Fields for identifying extreme sources in the Epoch of Reionisation.galaxiesastrometryredshiftedline-intensitiesabsolute-magnitudephotometryvisible-astronomyinfrared-astronomygalactic-and-extragalactic-astronomyobservational-astronomycosmologyinterdisciplinary-astronomyhttps://dc.g-vo.org/rr/q/lp/custom/CDS.VizieR/J/A+A/707/A239https://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/707/A2392026A&A...707A.239Vhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/707/A239Cone search capability for table J/A+A/707/A239/uviez7 (UltraVISTA+Euclid selection of LGB candidates for SED fit with HSC+VISTA+Spitzer/IRAC+Euclid (table 3))Cone search capability for table J/A+A/707/A239/uvistaz7 (UltraVISTA-only selection LGB candidates for SED fit with HSC+VISTA+Spitzer/IRAC without Euclid (table 3))Varadaraj R.G.Bowler R.A.A.Jarvis M.J.Weaver J.R.Banados E.,Holloway P.Caputi K.I.Wilkins S.M.Yang D.Milvang-Jensen B.,Gabarra L.Oesch P.A.Amara A.Andreon S.Auricchio N.Baccigalupi C.,Baldi M.Bardelli S.Biviano A.Branchini E.Brescia M.Camera S.,Canas-Herrera G.Capobianco V.Carbone C.Carretero J.Castellano M.,Castignani G.Cavuoti S.Chambers K.C.Cimatti A.Colodro-Conde C.,Congedo G.Conselice C.J.Conversi L.Copin Y.Courbin F.,Courtois H.M.Cropper M.Da Silva A.Degaudenzi H.De Lucia G.Dole H.,Dubath F.Duncan C.A.J.Dupac X.Dusini S.Escoffier S.Farina M.,Farinelli R.Faustini F.Ferriol S.Finelli F.Fosalba P.,Fourmanoit N.Frailis M.Franceschi E.Fumana M.Galeotta S.George K.,Gillis B.Giocoli C.Gracia-Carpio J.Grazian A.Grupp F.Guzzo L.,Haugan S.V.H.Hoar J.Hoekstra H.Holmes W.Hook I.M.Hormuth F.,Hornstrup A.Jahnke K.Jhabvala M.Joachimi B.Keihanen E.Kermiche S.,Kiessling A.Kilbinger M.Kubik B.Kummel M.Kunz M.Kurki-Suonio H.,Le Brun A.M.C.Ligori S.Lilje P.B.Lindholm V.Lloro I.Mainetti G.,Maino D.Maiorano E.Mansutti O.Marggraf O.Martinelli M.Martinet N.,Marulli F.Massey R.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.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.Renzi A.Rhodes J.Riccio G.,Romelli E.Roncarelli M.Rossetti E.Saglia R.Sakr Z.Sapone D.,Sartoris B.Schirmer M.Schneider P.Schrabback T.Secroun A.,Seidel G.Serrano S.Simon P.Sirignano C.Sirri G.Stanco L.,Starck J.-L.Steinwagner J.Tallada-Crespi P.Taylor A.N.Teplitz H.I.,Tereno I.Tessore N.Toft S.Toledo-Moreo R.Torradeflot F.,Tutusaus I.Valenziano L.Valiviita J.Vassallo T.Veropalumbo A.,Wang Y.Weller J.Zamorani G.Zerbi F.M.Zucca E.Martin-Fleitas J.,Scottez V.Viel M.CDS2026https://cds.unistra.fr/vizier-org/licences_vizier.htmlCDS support team <cds-question@unistra.fr>DatasetAstroObjectsastronomy