paper

The MOSDEF survey: a stellar mass-SFR-metallicity relation exists at

arXiv:1711.00224 · doi:10.3847/1538-4357/aabcbd

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 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 . The strength of this relation is similar to predictions from cosmological hydrodynamical simulations. By performing a direct comparison of stacks of and galaxies, we find that galaxies have 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 . 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.

19 pages, 8 figures, accepted to ApJ

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