The Stellar Metallicities of Massive Quiescent Galaxies at 1.0 < z < 1.3 from KMOS plus VANDELS

被引：25

作者：

Carnall, Adam C. ^{[1
]}

McLure, Ross J. ^{[1
]}

Dunlop, James S. ^{[1
]}

Hamadouche, Massissilia ^{[1
]}

Cullen, Fergus ^{[1
]}

McLeod, Derek J. ^{[1
]}

Begley, Ryan ^{[1
]}

Amorin, Ricardo ^{[2
,3
]}

Bolzonella, Micol ^{[4
]}

Castellano, Marco ^{[5
]}

Cimatti, Andrea ^{[6
,7
]}

Fontanot, Fabio ^{[8
,9
]}

Gargiulo, Adriana ^{[10
]}

Garilli, Bianca ^{[10
]}

Mannucci, Filippo ^{[7
]}

Pentericci, Laura ^{[5
]}

Talia, Margherita ^{[4
,6
]}

Zamorani, Giovani ^{[4
]}

Calabro, Antonello ^{[5
]}

Cresci, Giovanni ^{[7
]}

Hathi, Nimish P. ^{[11
]}

机构：

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

[2] Univ La Serena, Inst Invest Multidisciplinar Ciencia & Tecnol, La Serena 1305, Chile

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

[4] INAF OAS Bologna, Via P Gobetti 93-3, I-40129 Bologna, Italy

[5] INAF Osservatorio Astron Roma, Via Frascati 33, I-00078 Monte Porzio Catone, Italy

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

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

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

[9] IFPU Inst Fundamental Phys Universe, Via Beirut 2, I-34151 Trieste, Italy

[10] INAF IASF Milano, Via A Corti 12, I-20133 Milan, Italy

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

来源：

ASTROPHYSICAL JOURNAL | 2022年 / 929卷 / 02期

关键词：

STAR-FORMATION HISTORIES; LEGA-C; SPECTROSCOPIC SURVEY; POPULATION SYNTHESIS; FORMING GALAXIES; EVOLUTION; SPECTRA; AGES; RESOLUTION; EFFICIENT;

D O I：

10.3847/1538-4357/ac5b62

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We present a rest-frame UV-optical (lambda = 2500-6400 angstrom) stacked spectrum representative of massive quiescent galaxies at 1.0 < z < 1.3 with log(M-*/M-circle dot) > 10.8. The stack is constructed using VANDELS survey data, combined with new KMOS observations. We apply two independent full-spectral-fitting approaches, measuring a total metallicity [Z/H] = -0.13 +/- 0.08 with Bagpipes and [Z/H] = 0.04 +/- 0.14 with Alf, a fall of similar to 0.2-0.3 dex compared with the local universe. We also measure an iron abundance [Fe/H] = -0.18 +/- 0.08, a fall of similar to 0.15 dex compared with the local universe. We measure the alpha enhancement via the magnesium abundance, obtaining [Mg/Fe] = 0.23 +/- 0.12, consistent with galaxies of similar mass in the local universe, indicating no evolution in the average alpha enhancement of log(M-*/M-circle dot) similar to 11 quiescent galaxies over the last similar to 8 Gyr. This suggests the very high alpha enhancements recently reported for several bright z similar to 1-2 quiescent galaxies are due to their extreme masses, log(M-*/M-circle dot) greater than or similar to 11.5, in accordance with the well-known downsizing trend, rather than being typical of the z greater than or similar to 1 population. The metallicity evolution we observe with redshift (falling [Z/H], [Fe/H], constant [Mg/Fe]) is consistent with recent studies. We recover a mean stellar age of 2.5(-0.4)(+0.6) Gyr, corresponding to a formation redshift z(form) =2.4(-0.3)(+0.6) z greater than or similar to 1 massive quiescent galaxies, and, as these studies report consistent metallicities, we identify models with different star formation histories as the most likely cause. Larger spectroscopic samples from upcoming ground-based instruments will provide precise constraints on ages and metallicities at z greater than or similar to 1. Combining these with precise stellar mass functions for z > 2 quiescent galaxies from the James Webb Space Telescope will provide an independent test of formation redshifts derived from spectral fitting.

引用

页数：12

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The Stellar Metallicities of Massive Quiescent Galaxies at 1.0 &lt; z &lt; 1.3 from KMOS plus VANDELS

The Stellar Metallicities of Massive Quiescent Galaxies at 1.0 < z < 1.3 from KMOS plus VANDELS