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

被引：26
|
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.
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页数：12
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