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Evolution of the Stellar Mass–Metallicity Relation. I. Galaxies in the z ∼ 0.4 Cluster Cl0024

Leethochawalit, Nicha and Kirby, Evan N. and Moran, Sean M. and Ellis, Richard S. and Treu, Tommaso (2018) Evolution of the Stellar Mass–Metallicity Relation. I. Galaxies in the z ∼ 0.4 Cluster Cl0024. Astrophysical Journal, 856 (1). Art. No. 15. ISSN 1538-4357. doi:10.3847/1538-4357/aab26a.

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We present the stellar mass–stellar metallicity relationship (MZR) in the galaxy cluster Cl0024+1654 at z ~ 0.4 using full-spectrum stellar population synthesis modeling of individual quiescent galaxies. The lower limit of our stellar mass range is M* = 10^(9.7) M ⊙, the lowest galaxy mass at which individual stellar metallicity has been measured beyond the local universe. We report a detection of an evolution of the stellar MZR with observed redshift at 0.037 ± 0.007 dex per Gyr, consistent with the predictions from hydrodynamical simulations. Additionally, we find that the evolution of the stellar MZR with observed redshift can be explained by an evolution of the stellar MZR with the formation time of galaxies, i.e., when the single stellar population (SSP)-equivalent ages of galaxies are taken into account. This behavior is consistent with stars forming out of gas that also has an MZR with a normalization that decreases with redshift. Lastly, we find that over the observed mass range, the MZR can be described by a linear function with a shallow slope ([Fe/H] ∝ (0.16 ± 0.03) log M*. The slope suggests that galaxy feedback, in terms of mass-loading factor, might be mass-independent over the observed mass and redshift range.

Item Type:Article
Related URLs:
URLURL TypeDescription Paper
Leethochawalit, Nicha0000-0003-4570-3159
Kirby, Evan N.0000-0001-6196-5162
Moran, Sean M.0000-0002-9194-5071
Ellis, Richard S.0000-0001-7782-7071
Treu, Tommaso0000-0002-8460-0390
Additional Information:© 2018 The American Astronomical Society. Received 2017 November 9; revised 2018 February 20; accepted 2018 February 23; published 2018 March 21. The authors thank the referee for a constructive and helpful report. We also thank Anna Gallazzi and Jieun Choi for kindly providing data, catalogs, and feedback to the paper, and thank Xiangcheng Ma, Yu Lu, Shea Garrison-Kimmel, and Robyn Sanderson for useful discussions. E.N.K. and N.L. acknowledge support from the National Science Foundation grant AST-1614081.
Group:Astronomy Department
Funding AgencyGrant Number
Subject Keywords:galaxies: abundances – galaxies: evolution – galaxies: stellar content
Issue or Number:1
Record Number:CaltechAUTHORS:20180327-104247834
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Official Citation:Nicha Leethochawalit et al 2018 ApJ 856 15
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:85453
Deposited By: Tony Diaz
Deposited On:27 Mar 2018 18:30
Last Modified:15 Nov 2021 20:28

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