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

被引：58

作者：

Cullen, F. ^{[1
]}

Shapley, A. E. ^{[2
]}

McLure, R. J. ^{[1
]}

Dunlop, J. S. ^{[1
]}

Sanders, R. L. ^{[3
]}

Topping, M. W. ^{[2
]}

Reddy, N. A. ^{[4
]}

Amorin, R. ^{[5
,6
]}

Begley, R. ^{[1
]}

Bolzonella, M. ^{[7
]}

Calabro, A. ^{[8
]}

Carnall, A. C. ^{[1
]}

Castellano, M. ^{[8
]}

Cimatti, A. ^{[9
,10
]}

Cirasuolo, M. ^{[11
]}

Cresci, G. ^{[10
]}

Fontana, A. ^{[8
]}

Fontanot, F. ^{[12
]}

Garilli, B. ^{[13
]}

Guaita, L. ^{[14
]}

Hamadouche, M. ^{[1
]}

Hathi, N. P. ^{[15
]}

Mannucci, F. ^{[10
]}

McLeod, D. J. ^{[1
]}

Pentericci, L. ^{[8
]}

Saxena, A. ^{[16
]}

Talia, M. ^{[7
,9
]}

Zamorani, G. ^{[7
]}

机构：

[1] Univ Edinburgh, Inst Astron, Royal Observ, SUPA, Edinburgh EH9 3HJ, Midlothian, Scotland

[2] Univ Calif Los Angeles, Dept Phys & Astron, 430 Portola Plaza, Los Angeles, CA 90095 USA

[3] Univ Calif Davis, Dept Phys & Astron, One Shields Ave, Davis, CA 95616 USA

[4] Univ Calif Riverside, Dept Phys & Astron, 900 Univ Ave, Riverside, CA 92521 USA

[5] Univ La Serena, Inst Invest Multidisciplinar Ciencia & Tecnol, Raul Bitran 1305, La Serena, Chile

[6] Univ La Serena, Dept Fis & Astron, Av Juan Cisternas 1200 Norte, La Serena, Chile

[7] INAF Osservatorio Astron Bologna, Via P Gobetti 93-3, I-40129 Bologna, Italy

[8] INAF Osservatorio Astron Roma, Via Frascati 33, I-00040 Monte Porzio Catone, RM, Italy

[9] Univ Bologna, Dept Phys & Astron DIFA, Via Gobetti 93-2, I-40129 Bologna, Italy

[10] INAF Osservatorio Astrofis Arcetri, Largo E Fermi 5, I-50125 Florence, Italy

[11] European Southern Observ, Karl Schwarzschild Str 2, D-86748 Garching, Germany

[12] INAF Astron Observ Trieste, Via GB Tiepolo 11, I-34143 Trieste, Italy

[13] INAF IASF Milano, Via Bassini 15, I-20133 Milan, Italy

[14] Univ Andres Bello, Dept Ciencias Fis, Fernandez Concha 700, Santiago, Chile

[15] Space Telescope Sci Inst, 3700 San Martin Dr, Baltimore, MD 21218 USA

[16] UCL, Dept Phys & Astron, Gower St, London WC1E 6BT, England

来源：

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | 2021年 / 505卷 / 01期

基金：

英国科学技术设施理事会;

关键词：

galaxies: abundances; galaxies: high redshift; MASS-METALLICITY RELATION; NEAR-INFRARED SPECTROSCOPY; EMISSION-LINE GALAXIES; MOSDEF-LRIS SURVEY; STELLAR METALLICITY; VANDELS SURVEY; IONIZED-GAS; FORMATION HISTORIES; PHYSICAL-PROPERTIES; NON-LTE;

D O I：

10.1093/mnras/stab1340

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We present results from the NIRVANDELS survey on the gas-phase metallicity (Z(g), tracing O/H) and stellar metallicity (Z(star), 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 angstrom) and rest-frame optical (3400-5500 angstrom), respectively, we present the first simultaneous determination of the stellar and gas-phase mass-metallicity relationships (MZRs) at z similar or equal to 3.4. In both cases, we find that metallicity increases with increasing stellar mass (M-star) and that the power-law slope at M-star less than or similar to 10(10)M(circle dot) of both MZRs scales as Z proportional to M-*(0.3). Comparing the stellar and gas-phase MZRs, we present direct evidence for super-solar O/Fe ratios (i.e. alpha-enhancement) at z > 3, finding (O/Fe) = 2.54 +/- 0.38 x (O/Fe)(circle dot), with no clear dependence on M-star.

引用

页码：903 / 920

页数：18

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