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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
earth and planetary sciences
The MOSDEF Survey: A Stellar Mass-SFR-Metallicity Relation Exists at z ∼ 2.3
Astrophysical Journal, Volume 858, No. 2, Article 99, Year 2018
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Description
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. © 2018. The American Astronomical Society. All rights reserved.
Authors & Co-Authors
Sanders, Ryan L.
United States, Los Angeles
University of California, Los Angeles
Shapley, Alice E.
United States, Los Angeles
University of California, Los Angeles
Kriek, Mariska T.
United States, Berkeley
University of California, Berkeley
Freeman, William R.
United States, Riverside
University of California, Riverside
Reddy, Naveen A.
United States, Riverside
University of California, Riverside
Siana, Brian D.
United States, Riverside
University of California, Riverside
Coil, Alison L.
United States, La Jolla
University of California, San Diego
Mobasher, Bahram
United States, Riverside
University of California, Riverside
Dav́e, Romeel
United Kingdom, Edinburgh
The University of Edinburgh
Shivaei, Irene
United States, Tucson
The University of Arizona
Azadi, Mojegan
United States, La Jolla
University of California, San Diego
Price, Sedona H.
Germany, Garching Bei Munchen
Max Planck Institute for Extraterrestrial Physics
Leung, Gene C.K.
United States, La Jolla
University of California, San Diego
Groot, Laura De
United States, Wooster
The College of Wooster
Barro, Guillermo
United States, Stockton
University of the Pacific, California
Statistics
Citations: 99
Authors: 15
Affiliations: 10
Identifiers
Doi:
10.3847/1538-4357/aabcbd
ISSN:
0004637X
Research Areas
Environmental
Study Design
Cross Sectional Study
Study Approach
Quantitative