Cullen, F.F.CullenShapley, A. E.A. E.ShapleyMcLure, R. J.R. J.McLureDunlop, J. S.J. S.DunlopSanders, R. L.R. L.SandersTopping, M. W.M. W.ToppingReddy, N. A.N. A.ReddyAmorín, R.R.AmorínBegley, R.R.BegleyBOLZONELLA, MICOLMICOLBOLZONELLACalabrò, A.A.CalabròCarnall, A. C.A. C.CarnallCASTELLANO, MARCOMARCOCASTELLANOCimatti, A.A.CimattiCirasuolo, M.M.CirasuoloCRESCI, GIOVANNIGIOVANNICRESCIFONTANA, AdrianoAdrianoFONTANAFONTANOT, FabioFabioFONTANOTGARILLI, BIANCA MARIA ROSABIANCA MARIA ROSAGARILLIGuaita, L.L.GuaitaHamadouche, M.M.HamadoucheHathi, N. P.N. P.HathiMANNUCCI, FILIPPOFILIPPOMANNUCCIMcLeod, D. J.D. J.McLeodPENTERICCI, LauraLauraPENTERICCISAXENA, AAYUSHAAYUSHSAXENATalia, M.M.TaliaZamorani, G.G.Zamorani2022-03-242022-03-2420210035-8711http://hdl.handle.net/20.500.12386/31893We present results from the NIRVANDELS survey on the gas-phase metallicity (Z<SUB>g</SUB>, tracing O/H) and stellar metallicity (Z<SUB>⋆</SUB>, tracing Fe/H) of 33 star-forming galaxies at redshifts 2.95 < z < 3.80. Based on a combined analysis of deep optical and near-IR spectra, tracing the rest-frame far-ultraviolet (FUV; 1200-2000 Å) and rest-frame optical (3400-5500 Å), respectively, we present the first simultaneous determination of the stellar and gas-phase mass-metallicity relationships (MZRs) at z ≃ 3.4. In both cases, we find that metallicity increases with increasing stellar mass (M<SUB>⋆</SUB>) and that the power-law slope at M<SUB>⋆</SUB> ≲ 10<SUP>10</SUP>M<SUB>⊙</SUB> of both MZRs scales as $Z \propto M_{\star }^{0.3}$. Comparing the stellar and gas-phase MZRs, we present direct evidence for super-solar O/Fe ratios (i.e. α-enhancement) at z > 3, finding (O/Fe) = 2.54 ± 0.38 × (O/Fe)<SUB>⊙</SUB>, with no clear dependence on M<SUB>⋆</SUB>.STAMPAenArticle10.1093/mnras/stab13402-s2.0-85108175008https://academic.oup.com/mnras/article/505/1/903/6274679?login=truehttp://arxiv.org/abs/2103.06300v22021MNRAS.505..903CFIS/05 - ASTRONOMIA E ASTROFISICAERC sectors::Physical Sciences and Engineering::PE9 Universe sciences: astro-physics/chemistry/biology; solar systems; stellar, galactic and extragalactic astronomy, planetary systems, cosmology, space science, instrumentation