J/A+A/710/L15ivo://CDS.VizieR/J/A+A/710/L15CDSKorber D.Schaerer D.Marques-Chaves R.Adamo A.Basu A.Chisholm J.,Dessauges-Zavadsky M.McQuinn K..B.W.Saldana-Lopez A.Atek H.,Endsley R.Fujimoto S.Furtak L.J.Kokorev V.Naidu R.P.Pan R.2026-06-10T08:15:01Z2026-06-10T09:14:41ZCDS support team

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

cds-question@unistra.frgalaxieschemical-abundancesredshiftedultraviolet-astronomyWe report the measurement of the R3=[OIII]5008/H{beta} ratios for 54 galaxies in the GLIMPSE-D survey. Thanks to gravitational lensing, our sample includes galaxies with -20<Muv<-14 at z=6-9. We derive oxygen abundances using calibrated relationships. We observe a significant decline in R3 values below Muv>-18, which we interpret as evidence of decreasing metallicities in fainter regimes. We explore four prescription models of the evolution of R3 with UV emission based on the new measurements and results from previous surveys. Applying these models to the GLIMPSE [OIII]+H{beta} luminosity functions, we measure and extrapolate the ionising photon production rate dotNion of galaxies down to very faint limits SFR(Ha)>5x10^-3^M_{sun}+/yr. Our results support the dominant contribution of star-forming galaxies to reionisation, and are consistent with the recent discovery of ultra-faint metal-poor galaxies. Our measurements of the relative contribution of each luminosity bin show that galaxies with L(Ha)~1e41 to 1e42 erg/s dominate at 8<z<9, but the relative contributions become more uniform at 7<z<8. Extreme models either under- or over-estimate the ionising photon budget, while intermediate models align with recent observational constraints.2026A&A...710L..15Khttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/710/L15CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/710/L15https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/710/L15http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/710/L15https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/710/L15https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/710/L15http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/710/L15GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/710/L15/tablee1 (*Catalog)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/710/L15/tablee1?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/710/L15/tablee1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/710/L15/tablee1?GETtext/xml+votable180.050000true342.22476196-44.567356110.0055555555555555566/46474https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/710/L15?format=asciiUVdefaultJ/A+A/710/L15/tablee1*CatalogrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintIDGLIMPSE identification numbermeta.id;meta.mainintRAJ2000Right ascension (J2000)degpos.eq.ra;meta.mainDEJ2000Declination (J2000)degpos.eq.dec;meta.mainzspSpectroscopic redshiftsrc.redshiftfloatMuv? Absolute magnitude (1)magphys.magAbsdoublenullablemuLensing magnificationphot.flux;arith.ratiodouble[OIII]-50Median measurement of [OIII]5008 (in 10^-19^erg/cm^2^/s) (1)1e-22W.m**-2phot.fluxdouble[OIII]-1616th percentile of [OIII]5008 (in 10^-19^erg/cm^2^/s) (1)1e-22W.m**-2phot.fluxdouble[OIII]-8484th percentile of [OIII]5008 (in 10^-19^erg/cm^2^/s) (1)1e-22W.m**-2phot.fluxdoubleHb-50Median measurement of Hbeta (in 10^-19^erg/cm^2^/s) (1)1e-22W.m**-2phot.flux;em.line.HbetadoubleHb-1616th percentile of Hbeta (in 10^-19^erg/cm^2^/s) (1)1e-22W.m**-2phot.flux;em.line.HbetadoubleHb-8484th percentile of Hbeta (in 10^-19^erg/cm^2^/s) (1)1e-22W.m**-2phot.flux;em.line.HbetadoubleR3-50Median measurement of R3=[OIII]5008/Hn ratiophot.flux;arith.ratiodoubleR3-1616th percentile of R3phot.flux;arith.ratiodoubleR3-8484th percentile of R3phot.flux;arith.ratiodoubleZ-50Median of 12+log(O/H)phys.abunddoubleZ-1616th percentile of 12+log(O/H)phys.abunddoubleZ-8484th percentile of 12+log(O/H)phys.abunddouble