2026A&A...707A.239V

Query : 2026A&A...707A.239V

2026A&A...707A.239V - Astronomy and Astrophysics, volume 707A239 (2026/3-1)

Euclid: Discovery of bright z ≃ 7 Lyman-break galaxies in UltraVISTA and Euclid COSMOS.

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. and VIEL M.

Abstract (from CDS):

We present a search for z ≃ 7 Lyman-break galaxies using the 1.72 deg2 near-infrared (NIR) UltraVISTA survey in the COSMOS field, reaching 5σ depths in Y of 26.2. We incorporated deep Euclid optical and Euclid + Spitzer NIR imaging for a full spectral energy distribution (SED) fitting analysis. We found 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 conducted a separate selection by including complementary Euclid performance verification imaging (reaching 5σ depths of 26.3), yielding 140 galaxies in 0.65 deg2, with 38 sources unique to this sample. We computed the rest-frame UV luminosity function (UV LF) from our samples, extending below the knee ($ M^{*}=-21.14^{+0.28}_{-0.25} $). We find that the shape of the UV LF is consistent with both a Schechter function and a 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 NIR filters identifying molecular absorption features in the SEDs of ultra-cool dwarf interlopers, and additional faint galaxies were 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-α emitter candidate identified by combining HSC, VISTA, and Euclid broadband photometry, highlighting the synergistic power these instruments will have in the Euclid Auxiliary Fields for identifying extreme sources in the epoch of reionisation.

Abstract Copyright: © The Authors 2026

Journal keyword(s): galaxies: evolution - galaxies: formation - galaxies: high-redshift - galaxies: luminosity function - mass function - galaxies: photometry

VizieR on-line data: <Available at CDS (J/A+A/707/A239): uviez7.dat uvistaz7.dat list.dat fits/*>

Status at CDS : Tables of objects will be appraised for possible ingestion in SIMBAD.

Simbad objects: 11

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Number of rows : 11
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 [CFT2022] GHZ2 G 00 13 59.760 -30 19 29.07           ~ 91 0
2 NAME Himiko EmG 02 17 57.6122 -05 08 44.898           ~ 113 0
3 NAME XMM-LSS Field reg 02 18 00 -07 00.0           ~ 347 0
4 JADES-GS NC 18044 EmG 03 32 17.8244 -27 53 09.316           ~ 18 0
5 JADES-GS+053.08294-27.85563 EmG 03 32 19.905 -27 51 20.28           ~ 50 0
6 NAME Extended Chandra Deep Field South reg 03 32 30.0 -27 48 20           ~ 862 0
7 COSMOS2015 969849 G 09 59 19.360 +02 46 41.40           ~ 10 0
8 COSMOS2015 623787 EmG 09 59 21.680 +02 14 53.02           ~ 10 0
9 NAME COSMOS Field reg 10 00 28.60 +02 12 21.0           ~ 3639 0
10 COSMOS2015 338645 EmG 10 00 58.01148 +01 48 15.3000           ~ 101 0
11 [OBV2016] GN-z11 EmG 12 36 25.46 +62 14 31.4           ~ 247 0

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