TY - JOUR
T1 - The NIRVANDELS Survey
T2 - A robust detection of α-enhancement in star-forming galaxies at z ≃3.4
AU - Cullen, F.
AU - Shapley, A. E.
AU - McLure, R. J.
AU - Dunlop, J. S.
AU - Sanders, R. L.
AU - Topping, M. W.
AU - Reddy, N. A.
AU - Amorín, R.
AU - Begley, R.
AU - Bolzonella, M.
AU - Calabrò, A.
AU - Carnall, A. C.
AU - Castellano, M.
AU - Cimatti, A.
AU - Cirasuolo, M.
AU - Cresci, G.
AU - Fontana, A.
AU - Fontanot, F.
AU - Garilli, B.
AU - Guaita, L.
AU - Hamadouche, M.
AU - Hathi, N. P.
AU - Mannucci, F.
AU - McLeod, D. J.
AU - Pentericci, L.
AU - Saxena, A.
AU - Talia, M.
AU - Zamorani, G.
N1 - Publisher Copyright:
© 2021 The Author(s) Published by Oxford University Press on behalf of Royal Astronomical Society.
PY - 2021/7/1
Y1 - 2021/7/1
N2 - We present results from the NIRVANDELS survey on the gas-phase metallicity (Zg, tracing O/H) and stellar metallicity (Z∗, 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∗) and that the power-law slope at M∗ ≤ 1010M⊙ of both MZRs scales as Z ∝ M∗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)⊙, with no clear dependence on M∗.
AB - We present results from the NIRVANDELS survey on the gas-phase metallicity (Zg, tracing O/H) and stellar metallicity (Z∗, 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∗) and that the power-law slope at M∗ ≤ 1010M⊙ of both MZRs scales as Z ∝ M∗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)⊙, with no clear dependence on M∗.
KW - Galaxies: abundances
KW - Galaxies: high redshift
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U2 - 10.1093/mnras/stab1340
DO - 10.1093/mnras/stab1340
M3 - Article
AN - SCOPUS:85108175008
SN - 0035-8711
VL - 505
SP - 903
EP - 920
JO - Monthly Notices of the Royal Astronomical Society
JF - Monthly Notices of the Royal Astronomical Society
IS - 1
ER -