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Paper: Stellar-Mass Metallicity Relation at z ∼ 1.4
Volume: 458, Galactic Archaeology: Near-Field Cosmology and the Formation of the Milky Way
Page: 87
Authors: Ohta, K.; Yabe, K.; Iwamuro, F.; Yuma, S.; Akiyama, M.; Tamura, N.; FMOS team
Abstract: With Fibre Multi-Object Spectrograph on the Subaru Telescope, we obtained gas metallicity for ∼70 star-forming galaxies at z ∼ 1.4. The sample galaxies are selected from objects with K < 23.9(AB) mag in the SXDS/UDS field. Among them, galaxies with Mstar > 109.5 M at 1.2 < zph < 1.6 and with expected Hα flux larger than 1×10–16 erg s-1 cm–2 were observed. We derived a mass-metallicity relation at the redshift and found the relation locates between those previously obtained at z ∼ 0.8 and at z ∼ 2.2. The shape of the relation is similar to those at other redshifts, showing a smooth evolution of mass-metallicity relations from ∼ 3 to ∼ 0.1, except for a very massive part at z ∼ 0.1. The metallicity distribution of the galaxies at a fixed stellar mass, however, shows a significant scatter around the relation. The estimated intrinsic scatter is ∼ 0.1 dex or larger. We examined the cause for the scatter and found the trends that the metallicity is lower for the galaxies with larger star-formation rates and larger sizes. Our data points show a large scatter with respect to the Fundamental Metallicity Relation (FMR) obtained at z ∼ 0.1, but the average metallicity is close to the FMR with a small offset.
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