Yabe, K;
Ohta, K;
Akiyama, M;
Bunker, A;
Dalton, G;
Ellis, R;
Glazebrook, K;
... Totani, T; + view all
(2015)
The Subaru FMOS Galaxy Redshift Survey (FastSound). III. The mass–metallicity relation and the fundamental metallicity relation at z ∼ 1.4.
Publications of the Astronomical Society of Japan
, 67
(6)
, Article 102. 10.1093/pasj/psv079.
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Abstract
We present the results from a large near-infrared spectroscopic survey made with Subaru/FMOS (FastSound) consisting of ∼ 4000 galaxies at z ∼ 1.4 with significant Hα detection. We measure the gas-phase metallicity from the [N II]λ6583/Hα emission line ratio of the composite spectra in various stellar mass and star-formation rate bins. The resulting mass–metallicity relation generally agrees with previous studies obtained in a similar redshift range to that of our sample. No clear dependence of the mass–metallicity relation on star-formation rate is found. Our result at z ∼ 1.4 is roughly in agreement with the fundamental metallicity relation at z ∼ 0.1 with a fiber aperture corrected star-formation rate. We detect significant [S II]λλ6716,6731 emission lines from the composite spectra. The electron density estimated from the [S II]λλ6716,6731 line ratio ranges from 10–500 cm−3, which generally agrees with that of local galaxies. On the other hand, the distribution of our sample on [N II]λ6583/Hα vs. [S II]λλ6716,6731/Hα is different to that found locally. 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 at z ∼ 1.4 recalculated with this N/O enhancement taken into account decreases by 0.1–0.2 dex. The resulting metallicity is lower than the local fundamental metallicity relation.
| Type: | Article |
|---|---|
| Title: | The Subaru FMOS Galaxy Redshift Survey (FastSound). III. The mass–metallicity relation and the fundamental metallicity relation at z ∼ 1.4 |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1093/pasj/psv079 |
| Publisher version: | http://dx.doi.org/10.1093/pasj/psv079 |
| Language: | English |
| Additional information: | This is a pre-copyedited, author-produced PDF of an article accepted for publication in Publications of the Astronomical Society of Japan following peer review. The version of record, Yabe, K; Ohta, K; Akiyama, M; Bunker, A; Dalton, G; Ellis, R; Glazebrook, K; (2015) The Subaru FMOS Galaxy Redshift Survey (FastSound). III. The mass–metallicity relation and the fundamental metallicity relation at z ∼ 1.4. Publications of the Astronomical Society of Japan, 67 (6), Article 102, is available online at: http://dx.doi.org/10.1093/pasj/psv079. |
| Keywords: | galaxies: abundances, galaxies: evolution, galaxies: high-redshift, galaxies: ISM |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Physics and Astronomy |
| URI: | https://discovery.ucl.ac.uk/id/eprint/1493152 |
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