%0 Generic %1 yabe2015subaru %A Yabe, Kiyoto %A Ohta, Kouji %A Akiyama, Masayuki %A Bunker, Andrew %A Dalton, Gavin %A Ellis, Richard %A Glazebrook, Karl %A Goto, Tomotsugu %A Imanishi, Masatoshi %A Iwamuro, Fumihide %A Okada, Hiroyuki %A Shimizu, Ikkoh %A Takato, Naruhisa %A Tamura, Naoyuki %A Tonegawa, Motonari %A Totani, Tomonori %D 2015 %K gas metallicity moderate redshift sfr %T The Subaru FMOS Galaxy Redshift Survey (FastSound). III. The mass-metallicity relation and the fundamental metallicity relation at $z\sim1.4$ %U http://arxiv.org/abs/1508.01512 %X We present the results from a large near-infrared spectroscopic survey with Subaru/FMOS (FastSound) consisting of $\sim$ 4,000 galaxies at $z\sim1.4$ with significant H$\alpha$ detection. We measure the gas-phase metallicity from the N~ii$łambda$6583/H$\alpha$ 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 with star-formation rate is found. Our result at $z\sim1.4$ is roughly in agreement with the fundamental metallicity relation at $z\sim0.1$ with fiber aperture corrected star-formation rate. We detect significant S~ii$łambdałambda$6716,6731 emission lines from the composite spectra. The electron density estimated from the S~\sc ii$łambdałambda$6716,6731 line ratio ranges from 10 -- 500 cm$^-3$, which generally agrees with that of local galaxies. On the other hand, the distribution of our sample on N~ii$łambda$6583/H$\alpha$ vs. S~\sc ii$łambdałambda$6716,6731/H$\alpha$ is different from 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 $z\sim1.4$ is significantly higher than the local values at a fixed metallicity and stellar mass. The metallicity at $z\sim1.4$ 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.

@misc{yabe2015subaru, abstract = {We present the results from a large near-infrared spectroscopic survey with Subaru/FMOS (\textit{FastSound}) consisting of $\sim$ 4,000 galaxies at $z\sim1.4$ with significant H$\alpha$ detection. We measure the gas-phase metallicity from the [N~{\sc ii}]$\lambda$6583/H$\alpha$ 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 with star-formation rate is found. Our result at $z\sim1.4$ is roughly in agreement with the fundamental metallicity relation at $z\sim0.1$ with fiber aperture corrected star-formation rate. We detect significant [S~{\sc ii}]$\lambda\lambda$6716,6731 emission lines from the composite spectra. The electron density estimated from the [S~{\sc ii}]$\lambda\lambda$6716,6731 line ratio ranges from 10 -- 500 cm$^{-3}$, which generally agrees with that of local galaxies. On the other hand, the distribution of our sample on [N~{\sc ii}]$\lambda$6583/H$\alpha$ vs. [S~{\sc ii}]$\lambda\lambda$6716,6731/H$\alpha$ is different from 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 $z\sim1.4$ is significantly higher than the local values at a fixed metallicity and stellar mass. The metallicity at $z\sim1.4$ 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.}, added-at = {2015-08-10T09:41:49.000+0200}, author = {Yabe, Kiyoto and Ohta, Kouji and Akiyama, Masayuki and Bunker, Andrew and Dalton, Gavin and Ellis, Richard and Glazebrook, Karl and Goto, Tomotsugu and Imanishi, Masatoshi and Iwamuro, Fumihide and Okada, Hiroyuki and Shimizu, Ikkoh and Takato, Naruhisa and Tamura, Naoyuki and Tonegawa, Motonari and Totani, Tomonori}, biburl = {https://www.bibsonomy.org/bibtex/22adf82352d0203f03ae2ce1811e9bfb8/miki}, description = {[1508.01512] The Subaru FMOS Galaxy Redshift Survey (FastSound). III. The mass-metallicity relation and the fundamental metallicity relation at $z\sim1.4$}, interhash = {c4d030628d531966fa940a99db028539}, intrahash = {2adf82352d0203f03ae2ce1811e9bfb8}, keywords = {gas metallicity moderate redshift sfr}, note = {cite arxiv:1508.01512Comment: 14 pages, 10 figures, 2 tables, accepted for publication in PASJ}, timestamp = {2015-08-10T09:41:49.000+0200}, title = {The Subaru FMOS Galaxy Redshift Survey (FastSound). III. The mass-metallicity relation and the fundamental metallicity relation at $z\sim1.4$}, url = {http://arxiv.org/abs/1508.01512}, year = 2015 }