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Paper: The Subaru FMOS Galaxy Redshift Survey (FastSound): The Mass-Metallicity Relation and the Fundamental Metallicity Relation at z∼1.4
Volume: 507, Multi-Object Spectroscopy in the Next Decade: Big Questions, Large Surveys, and Wide Fields
Page: 355
Authors: Yabe, K.; Ohta, K.; Akiyama, M.; Tamura, N.; Iwamuro, F.; Totani, T.; Dalton, G.; Bunker, A.; FastSound team
Abstract: We present results from a large NIR spectroscopic survey (FastSound) with Subaru/FMOS, consisting of ∼4,000 galaxies at z∼1.4 with significant Hα detection. The resulting mass-metallicity relation generally agrees with those obtained previously in a similar redshift range to our sample. No clear dependence on the mass-metallicity relation on star-formation rate is found, which is not in agreement with the extrapolation of the local fundamental metallicity relation. We estimate the nitrogen-to-oxygen abundance ratio (N/O) from the N2S2 index, and find that the N/O in galaxies at z∼1.4 is significantly higher than the local values at a fixed metallicity and stellar mass. The metallicity derived by using the N2 method calibrated in the local universe decreases by ∼0.2 dex if we correct the N/O enhancement.
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