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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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