Journal
ASTROPHYSICAL JOURNAL LETTERS
Volume 771, Issue 2, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/2041-8205/771/2/L19
Keywords
galaxies: abundances; galaxies: evolution; galaxies: high-redshift; galaxies: ISM
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Funding
- NSF EARLY CAREER AWARD [AST07-48559]
- Direct For Mathematical & Physical Scien
- Division Of Astronomical Sciences [0748559] Funding Source: National Science Foundation
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We calculate the stellar mass-metallicity relation at five epochs ranging to z similar to 2.3. We quantify evolution in the shape of the mass-metallicity relation as a function of redshift; the mass-metallicity relation flattens at late times. There is an empirical upper limit to the gas-phase oxygen abundance in star-forming galaxies that is independent of redshift. From examination of the mass-metallicity relation and its observed scatter, we show that the flattening at late times is a consequence of evolution in the stellar mass where galaxies enrich to this empirical upper metallicity limit; there is also evolution in the fraction of galaxies at a fixed stellar mass that enrich to this limit. The stellar mass where metallicities begin to saturate is similar to 0.7 dex smaller in the local universe than it is at z similar to 0.8.
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