The FMOS-COSMOS Survey of Star-forming Galaxies at z ~ 1.6. II. The Mass-Metallicity Relation and the Dependence on Star Formation Rate and Dust Extinction

Autor(en)

, H. J. Zahid, D. Kashino, John D. Silverman, Christian Maier, Lisa Kewley, Emanuele Daddi, Alvio Renzini, Giulia Rodighiero, Taro Nagao, N. Arimoto, D. B. Sanders, Jeyhan S. Kartaltepe, S. J. Lilly, M. J. Geller, P. Capak, C. Marcella Carollo, J. Chu, G. Hasinger, O. Ilbert, M. Kajisawa, A. M. Koekemoer, Kornel Kovac, Olivier Le Fevre, D. Masters, Henry Joy McCracken, M. Onodera, N. Scoville, V. Strazzullo, N. Sugiyama, Y. Taniguchi

Abstrakt

We investigate the relationships between stellar mass, gas-phase oxygen abundance (metallicity), star formation rate (SFR), and dust content of star-forming galaxies at z 1.6 using Subaru/FMOS spectroscopy in the COSMOS field. The mass-metallicity (MZ) relation at z 1.6 is steeper than the relation observed in the local universe. The steeper MZ relation at z 1.6 is mainly due to evolution in the stellar mass where the MZ relation begins to turnover and flatten. This turnover mass is 1.2 dex larger at z 1.6. The most massive galaxies at z 1.6 (10

¹¹ M) are enriched to the level observed in massive galaxies in the local universe. The MZ relation we measure at z 1.6 supports the suggestion of an empirical upper metallicity limit that does not significantly evolve with redshift. We find an anti-correlation between metallicity and SFR for galaxies at a fixed stellar mass at z 1.6, which is similar to trends observed in the local universe. We do not find a relation between stellar mass, metallicity, and SFR that is independent of redshift; rather, our data suggest that there is redshift evolution in this relation. We examine the relation between stellar mass, metallicity, and dust extinction, and find that at a fixed stellar mass, dustier galaxies tend to be more metal rich. From examination of the stellar masses, metallicities, SFRs, and dust extinctions, we conclude that stellar mass is most closely related to dust extinction.

Organisation(en)

Institut für Astrophysik

Externe Organisation(en)

University of Tokyo, University of Hawaii at Manoa, National Astronomical Observatory of Japan, Graduate University for Advanced Studies , Harvard-Smithsonian Center for Astrophysics, California Institute of Technology (Caltech), Ehime University, Carnegie Institution for Science, Australian National University, IRFU CEA-Saclay laboratory , Kyoto University, Aix-Marseille Université, Nagoya University, INAF - Osservatorio Astronomico di Padova, Università degli Studi di Padova, National Optical Astronomy Observatory, Tucson, Eidgenössische Technische Hochschule Zürich, Space Telescope Science Institute, Université Paris VI - Pierre-et-Marie-Curie

Journal

The Astrophysical Journal

Band

792

Anzahl der Seiten

18

ISSN

0004-637X

DOI

https://doi.org/10.1088/0004-637X/792/1/75

Publikationsdatum

09-2014

Peer-reviewed

Ja

ÖFOS 2012

103003 Astronomie, 103004 Astrophysik

Schlagwörter

ASJC Scopus Sachgebiete

Astronomy and Astrophysics, Space and Planetary Science

Link zum Portal

https://ucrisportal.univie.ac.at/de/publications/6894e852-94ba-4413-9a72-7030cfac3856