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A Glimpse of the Stellar Populations and Elemental Abundances of Gravitationally Lensed, Quiescent Galaxies at z ≳ 1 with Keck Deep Spectroscopy

Zhuang, Zhuyun; Leethochawalit, Nicha; Kirby, Evan N.; Nightingale, J. W.; Steidel, Charles C.; Glazebrook, Karl; Barone, Tania M.; Skobe, Hannah; Sweet, Sarah M.; Nanayakkara, Themiya; Allen, Rebecca J.; G. C., Keerthi Vasan; Jones, Tucker; Kacprzak, Glenn G.; Tran, Kim-Vy H.; Jacobs, Colin

A Glimpse of the Stellar Populations and Elemental Abundances of Gravitationally Lensed, Quiescent Galaxies at z ≳ 1 with Keck Deep Spectroscopy Thumbnail


Authors

Zhuyun Zhuang

Nicha Leethochawalit

Evan N. Kirby

Charles C. Steidel

Karl Glazebrook

Tania M. Barone

Hannah Skobe

Sarah M. Sweet

Themiya Nanayakkara

Rebecca J. Allen

Keerthi Vasan G. C.

Tucker Jones

Glenn G. Kacprzak

Kim-Vy H. Tran

Colin Jacobs



Abstract

Gravitational lenses can magnify distant galaxies, allowing us to discover and characterize the stellar populations of intrinsically faint, quiescent galaxies that are otherwise extremely difficult to directly observe at high redshift from ground-based telescopes. Here, we present the spectral analysis of two lensed, quiescent galaxies at z ≳ 1 discovered by the ASTRO 3D Galaxy Evolution with Lenses survey: AGEL1323 (M* ∼ 1011.1M⊙, z = 1.016, μ ∼ 14.6) and AGEL0014 (M* ∼ 1011.5M⊙, z = 1.374, μ ∼ 4.3). We measured the age, [Fe/H], and [Mg/Fe] of the two lensed galaxies using deep, rest-frame-optical spectra (S/N ≳40 Å−1) obtained on the Keck I telescope. The ages of AGEL1323 and AGEL0014 are ${5.6}_{-0.8}^{+0.8}$ Gyr and ${3.1}_{-0.3}^{+0.8}$ Gyr, respectively, indicating that most of the stars in the galaxies were formed less than 2 Gyr after the Big Bang. Compared to nearby quiescent galaxies of similar masses, the lensed galaxies have lower [Fe/H] and [Mg/H]. Surprisingly, the two galaxies have comparable [Mg/Fe] to similar-mass galaxies at lower redshifts, despite their old ages. Using a simple analytic chemical evolution model connecting the instantaneously recycled element Mg with the mass-loading factors of outflows averaged over the entire star formation history, we found that the lensed galaxies may have experienced enhanced outflows during their star formation compared to lower-redshift galaxies, which may explain why they quenched early.

Citation

Zhuang, Z., Leethochawalit, N., Kirby, E. N., Nightingale, J. W., Steidel, C. C., Glazebrook, K., …Jacobs, C. (2023). A Glimpse of the Stellar Populations and Elemental Abundances of Gravitationally Lensed, Quiescent Galaxies at z ≳ 1 with Keck Deep Spectroscopy. Astrophysical Journal, 948(2), Article 132. https://doi.org/10.3847/1538-4357/acc79b

Journal Article Type Article
Acceptance Date Mar 24, 2023
Online Publication Date May 17, 2023
Publication Date May 10, 2023
Deposit Date Oct 31, 2023
Publicly Available Date Oct 31, 2023
Journal The Astrophysical Journal
Print ISSN 0004-637X
Electronic ISSN 1538-4357
Publisher American Astronomical Society
Peer Reviewed Peer Reviewed
Volume 948
Issue 2
Article Number 132
DOI https://doi.org/10.3847/1538-4357/acc79b
Keywords Space and Planetary Science; Astronomy and Astrophysics
Public URL https://durham-repository.worktribe.com/output/1872341

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Copyright Statement
© 2023. The Author(s). Published by the American Astronomical Society.
Original content from this work may be used under the terms of the Creative Commons Attribution 4.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI.




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