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Evolution of the Stellar Mass–Metallicity Relation. II. Constraints on Galactic Outflows from the Mg Abundances of Quiescent Galaxies

Leethochawalit, Nicha and Kirby, Evan N. and Ellis, Richard S. and Moran, Sean M. and Treu, Tommaso (2019) Evolution of the Stellar Mass–Metallicity Relation. II. Constraints on Galactic Outflows from the Mg Abundances of Quiescent Galaxies. Astrophysical Journal, 885 (2). Art. No. 100. ISSN 1538-4357.

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We present the stellar mass–[Fe/H] and mass–[Mg/H] relation of quiescent galaxies in two galaxy clusters at z ~ 0.39 and z ~ 0.54. We derive the age, [Fe/H], and [Mg/Fe] for each individual galaxy using a full-spectrum fitting technique. By comparing with the relations for z ~ 0 Sloan Digital Sky Survey galaxies, we confirm our previous finding that the mass–[Fe/H] relation evolves with redshift. The mass–[Fe/H] relation at higher redshift has lower normalization and possibly steeper slope. However, based on our sample, the mass–[Mg/H] relation does not evolve over the observed redshift range. We use a simple analytic chemical evolution model to constrain the average outflow that these galaxies experience over their lifetime, via the calculation of mass-loading factor. We find that the average mass-loading factor η is a power-law function of galaxy stellar mass, η ∝ M*^(−0.21±0.09). The measured mass-loading factors are consistent with the results of other observational methods for outflow measurements and with the predictions where outflow is caused by star formation feedback in turbulent disks.

Item Type:Article
Related URLs:
URLURL TypeDescription Paper
Leethochawalit, Nicha0000-0003-4570-3159
Kirby, Evan N.0000-0001-6196-5162
Ellis, Richard S.0000-0001-7782-7071
Moran, Sean M.0000-0002-9194-5071
Treu, Tommaso0000-0002-8460-0390
Additional Information:© 2019 The American Astronomical Society. Received 2019 March 14; revised 2019 September 19; accepted 2019 September 24; published 2019 November 5. We thank the referee for comments and suggestions that significantly improved the paper. The authors acknowledge Charlie Conroy, Philip Hopkins, and Gwen Rudie for useful feedback and the use of their models and fitting codes. Facilities: Keck:II (DEIMOS) - , Sloan - , GALEX - , HST (WFPC2) - , Subaru (Suprime-Cam) - , CFHT (CFH12k) - , Hale (WIRC). - Software: KCORRECT (Blanton & Roweis 2007), FSPS, (Conroy et al. 2009), alf (Conroy et al. 2018), MPFIT (Markwardt 2012).
Group:Astronomy Department
Subject Keywords:galaxies: abundances – galaxies: evolution – galaxies: stellar content
Issue or Number:2
Record Number:CaltechAUTHORS:20191105-094725372
Persistent URL:
Official Citation:Nicha Leethochawalit et al 2019 ApJ 885 100
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:99666
Deposited By: Tony Diaz
Deposited On:05 Nov 2019 18:04
Last Modified:05 Nov 2019 18:04

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