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The MOSDEF Survey: A Stellar Mass-SFR-Metallicity Relation Exists at z ∼ 2.3

Research output: Contribution to journalArticle

  • Ryan L. Sanders
  • Alice E. Shapley
  • Mariska Kriek
  • William R. Freeman
  • Naveen A. Reddy
  • Brian Siana
  • Alison L. Coil
  • Bahram Mobasher
  • Romeel Davé
  • Irene Shivaei
  • Mojegan Azadi
  • Sedona H. Price
  • Gene Leung
  • Tara Fetherholf
  • Laura De Groot
  • Tom Zick
  • Francesca M. Fornasini
  • Guillermo Barro

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Original languageEnglish
Article number99
JournalAstrophysical Journal
Volume858
Issue number2
DOIs
Publication statusPublished - 11 May 2018

Abstract

We investigate the nature of the relation among stellar mass, star formation rate, and gas-phase metallicity (the M-SFR-Z relation) at high redshifts using a sample of 260 star-forming galaxies at z∼2.3 from the MOSDEF survey. We present an analysis of the high-redshift M-SFR-Z relation based on several emission-line ratios for the first time. We show that a M-SFR-Z relation clearly exists at z∼2.3. The strength of this relation is similar to predictions from cosmological hydrodynamical simulations. By performing a direct comparison of stacks of z∼0 and z∼2.3 galaxies, we find that z∼2.3 galaxies have ∼0.1 dex lower metallicity at fixed M and SFR. In the context of chemical evolution models, this evolution of the M-SFR-Z relation suggests an increase with redshift of the mass-loading factor at fixed M, as well as a decrease in the metallicity of infalling gas that is likely due to a lower importance of gas recycling relative to accretion from the intergalactic medium at high redshifts. Performing this analysis simultaneously with multiple metallicity-sensitive line ratios allows us to rule out the evolution in physical conditions (e.g., N/O ratio, ionization parameter, and hardness of the ionizing spectrum) at fixed metallicity as the source of the observed trends with redshift and with SFR at fixed M at z∼2.3. While this study highlights the promise of performing high-order tests of chemical evolution models at high redshifts, detailed quantitative comparisons ultimately await a full understanding of the evolution of metallicity calibrations with redshift.

    Research areas

  • galaxies: abundances, galaxies: high redshift

ID: 76403640