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The Subaru FMOS Galaxy Redshift Survey (FastSound). III. The mass–metallicity relation and the fundamental metallicity relation at z ∼ 1.4

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 (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). Art. No. 102. ISSN 0004-6264. http://resolver.caltech.edu/CaltechAUTHORS:20160115-071942421

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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.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1093/pasj/psv079DOIArticle
http://pasj.oxfordjournals.org/content/67/6/102.abstractPublisherArticle
http://arxiv.org/abs/1508.01512arXivDiscussion Paper
Additional Information:© 2015 The Author. Published by Oxford University Press on behalf of the Astronomical Society of Japan. Received 2015 March 10; Accepted 2015 August 5. First published online September 23, 2015. We thank Tohru Nagao and Matthew A. Malkan for helpful discussions. We are grateful to the FMOS support astronomer Kentaro Aoki for his support during the observations. The FastSound project was supported in part by MEXT/JSPS KAKENHI Grant Numbers 19740099, 19035005, 20040005, 22012005, and 23684007. KO is supported by the Grant-in-Aid for Scientific Research (C)(24540230) from the Japan Society for the Promotion of Science (JSPS). Kavli IPMU is supported by World Premier International Research Center Initiative (WPI), MEXT, Japan. AB gratefully acknowledges the hospitality of the Research School of Astronomy & Astrophysics at the Australian National University, Mount Stromlo, Canberra where some of this work was done under the Distinguished Visitor scheme. This research has made use of the NASA/ IPAC Infrared Science Archive, which is operated by the Jet Propulsion Laboratory, California Institute of Technology, under contract with the National Aeronautics and Space Administration. We would like to express our acknowledgement to the indigenous Hawaiian people for their understanding of the significant role of the summit of Maunakea in astronomical research.
Group:Infrared Processing and Analysis Center (IPAC)
Funders:
Funding AgencyGrant Number
Japan Society for the Promotion of Science (JSPS)19740099
Japan Society for the Promotion of Science (JSPS)19035005
Japan Society for the Promotion of Science (JSPS)20040005
Japan Society for the Promotion of Science (JSPS)22012005
Japan Society for the Promotion of Science (JSPS)23684007
Japan Society for the Promotion of Science (JSPS)24540230
World Premier International Research Center Initiative (WPI)UNSPECIFIED
Ministry of Education, Culture, Sports, Science and Technology (MEXT)UNSPECIFIED
NASA/JPL/CaltechUNSPECIFIED
Subject Keywords:galaxies: abundances galaxies: evolution galaxies: high-redshift galaxies: ISM
Record Number:CaltechAUTHORS:20160115-071942421
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20160115-071942421
Official Citation:Kiyoto Yabe, Kouji Ohta, Masayuki Akiyama, Andrew Bunker, Gavin Dalton, Richard Ellis, Karl Glazebrook, Tomotsugu Goto, Masatoshi Imanishi, Fumihide Iwamuro, Hiroyuki Okada, Ikkoh Shimizu, Naruhisa Takato, Naoyuki Tamura, Motonari Tonegawa, and Tomonori Totani The Subaru FMOS Galaxy Redshift Survey (FastSound). III. The mass–metallicity relation and the fundamental metallicity relation at z ∼ 1.4 Publ Astron Soc Jpn (December 2015) 67 (6), 102, doi:10.1093/pasj/psv079 first published online September 23, 2015 (16 pages)
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:63694
Collection:CaltechAUTHORS
Deposited By: Ruth Sustaita
Deposited On:15 Jan 2016 17:23
Last Modified:15 Jan 2016 17:23

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