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http://hdl.handle.net/20.500.12386/31893
Titolo: | The NIRVANDELS Survey: a robust detection of α-enhancement in star-forming galaxies at z ≃ 3.4 | Autori: | Cullen, F. Shapley, A. E. McLure, R. J. Dunlop, J. S. Sanders, R. L. Topping, M. W. Reddy, N. A. Amorín, R. Begley, R. BOLZONELLA, MICOL Calabrò, A. Carnall, A. C. CASTELLANO, MARCO Cimatti, A. Cirasuolo, M. CRESCI, GIOVANNI FONTANA, Adriano FONTANOT, Fabio GARILLI, BIANCA MARIA ROSA Guaita, L. Hamadouche, M. Hathi, N. P. MANNUCCI, FILIPPO McLeod, D. J. PENTERICCI, Laura SAXENA, AAYUSH Talia, M. Zamorani, G. |
Data pubblicazione: | 2021 | Rivista: | MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | Numero: | 505 | Fascicolo: | 1 | Da pagina:: | 903 | Abstract: | We 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>. | URI: | http://hdl.handle.net/20.500.12386/31893 | URL: | https://academic.oup.com/mnras/article/505/1/903/6274679?login=true http://arxiv.org/abs/2103.06300v2 |
ISSN: | 0035-8711 | DOI: | 10.1093/mnras/stab1340 | Bibcode ADS: | 2021MNRAS.505..903C | Fulltext: | open |
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