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The Interstellar Medium in [O III]-selected Star-forming Galaxies at z similar to 3.2

Suzuki, Tomoko L. and Kodama, Tadayuki and Onodera, Masato and Shimakawa, Rhythm and Hayashi, Masao and Tadaki, Ken-ichi and Koyama, Yusei and Tanaka, Ichi and Sobral, David and Smail, Ian and Best, Philip N. and Khostovan, Ali A. and Minowa, Yosuke and Yamamoto, Moegi (2017) The Interstellar Medium in [O III]-selected Star-forming Galaxies at z similar to 3.2. The Astrophysical Journal, 849 (1). ISSN 0004-637X

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    We present new results from near-infrared spectroscopy with Keck/MOSFIRE of [O III]-selected galaxies at z similar to 3.2. With our H and K band spectra, we investigate the interstellar medium (ISM) conditions, such as ionization states and gas metallicities. [O III] emitters at z similar to 3.2 show a typical gas metallicity of 12+ log(O/H)= 8.07 +/- 0.07 at log(M-*/M-circle dot) similar to 9.0-9.2 and 12+ log(O/H)= 8.31 +/- 0.04 at log(M-*/M-circle dot) similar to 9.7-10.2 when using the empirical calibration method. We compare the [O III] emitters at z similar to 3.2 with UV-selected galaxies and Lya emitters at the same epoch and find that the [O III]-based selection does not appear to show any systematic bias in the selection of star-forming galaxies. Moreover, comparing with star-forming galaxies at z similar to 2 from the literature, our samples show similar ionization parameters and gas metallicities as those obtained by the previous studies that used the same calibration method. We find no strong redshift evolution in the ISM conditions between z similar to 3.2 and z similar to 2. Considering that the star formation rates at a fixed stellar mass also do not significantly change between the two epochs, our results support the idea that the stellar mass is the primary quantity to describe the evolutionary stages of individual galaxies at z > 2.

    Item Type: Journal Article
    Journal or Publication Title: The Astrophysical Journal
    Additional Information: This is an author-created, un-copyedited version of an article accepted for publication/published in Astrophysical Journal. IOP Publishing Ltd is not responsible for any errors or omissions in this version of the manuscript or any version derived from it. The Version of Record is available online at doi: 10.3847/1538-4357/aa8df3
    Departments: Faculty of Science and Technology > Physics
    ID Code: 89040
    Deposited By: ep_importer_pure
    Deposited On: 03 Jan 2018 10:56
    Refereed?: Yes
    Published?: Published
    Last Modified: 17 Jan 2019 00:46
    Identification Number:

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