期刊
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
卷 436, 期 2, 页码 1130-1141出版社
OXFORD UNIV PRESS
DOI: 10.1093/mnras/stt1641
关键词
galaxies: abundances; galaxies: evolution; galaxies: star formation
资金
- UK Science and Technology Facilities Council (STFC) [ST/I001573/1]
- Veni Fellowship
- Leverhulme Fellowship
- ERC Advanced Investigator programme DUSTYGAL
- Royal Society/Wolfson Merit Award
- Japanese Ministry of Education, Culture, Sports and Science [23740144, 24244015]
- Grants-in-Aid for Scientific Research [23740144, 23224005] Funding Source: KAKEN
- Science and Technology Facilities Council [ST/I001166/1, ST/I001573/1, ST/J001422/1, ST/I00162X/1, ST/J004650/1] Funding Source: researchfish
- STFC [ST/I001166/1, ST/I001573/1, ST/I00162X/1, ST/J004650/1, ST/J001422/1] Funding Source: UKRI
We obtained Subaru FMOS observations of H alpha emitting galaxies selected from the HiZELS, to investigate the relationship between stellar mass, metallicity and star formation rate (SFR) at z = 0.84-1.47, for comparison with the fundamental metallicity relation seen at low redshift. Our findings demonstrate, for the first time with a homogeneously selected sample, that a relationship exists for typical star-forming galaxies at z similar to 1-1.5 and that it is surprisingly similar to that seen locally. Therefore, star-forming galaxies at z similar to 1-1.5 are no less metal abundant than galaxies of similar mass and SFR at z similar to 0.1, contrary to claims from some earlier studies. We conclude that the bulk of the metal enrichment for this star-forming galaxy population takes place in the 4 Gyr before z similar to 1.5. We fit a new mass-metallicity-SFR plane to our data which is consistent with other high-redshift studies. However, there is some evidence that the mass-metallicity component of this high-redshift plane is flattened, at all SFR, compared with z similar to 0.1, suggesting that processes such as star formation-driven winds, thought to remove enriched gas from low-mass haloes, are yet to have as large an impact at this early epoch. The negative slope of the SFR-metallicity relation from this new plane is consistent with the picture that the elevation in the SFR of typical galaxies at z greater than or similar to 1 is fuelled by the inflow of metal-poor gas and not major merging.
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