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The NIRVANDELS Survey: A robust detection of α-enhancement in star-forming galaxies at z ≃3.4

Cullen, F; Shapley, AE; McLure, RJ; Dunlop, JS; Sanders, RL; Topping, MW; Reddy, NA; ... Zamorani, G; + view all (2021) The NIRVANDELS Survey: A robust detection of α-enhancement in star-forming galaxies at z ≃3.4. Monthly Notices of the Royal Astronomical Society , 505 (1) pp. 903-920. 10.1093/mnras/stab1340. Green open access

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Abstract

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∗.

Type: Article
Title: The NIRVANDELS Survey: A robust detection of α-enhancement in star-forming galaxies at z ≃3.4
Open access status: An open access version is available from UCL Discovery
DOI: 10.1093/mnras/stab1340
Publisher version: https://doi.org/10.1093/mnras/stab1340
Language: English
Additional information: © 2021 The Author(s). Published by Oxford University Press on behalf of Royal Astronomical Society. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted reuse, distribution, and reproduction in any medium, provided the original work is properly cited.
UCL classification: UCL
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Physics and Astronomy
URI: https://discovery.ucl.ac.uk/id/eprint/10130849
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