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.
Description
[1508.01512] The Subaru FMOS Galaxy Redshift Survey (FastSound). III. The mass-metallicity relation and the fundamental metallicity relation at $z\sim1.4$
%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
}