The distribution and physical properties of high-redshift [OIII] emitters in a cosmological hydrodynamics simulation

Kana Moriwaki*, Naoki Yoshida, Ikkoh Shimizu, Yuichi Harikane, Yuichi Matsuda, Hiroshi Matsuo, Takuya Hashimoto, Akio K. Inoue, Yoichi Tamura, Tohru Nagao

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

35 Citations (Scopus)


Recent observations with the Atacama Large Millimeter/submillimeter Array (ALMA) detected far-infrared emission lines such as the [OIII] 88μm line from galaxies at z ~ 7-9. We use a cosmological simulation of galaxy formation to study the physical properties of [O III] 88μm emitters. In a comoving volume of 50 h-1 Mpc on a side, we locate 34 galaxies with stellar masses greater than 108 M at z = 9, and more than 270 such galaxies at z = 7. We calculate the [O III] 88μm luminosities (LOIII,88) by combining a physical model of HII regions with emission line calculations using the photoionization code CLOUDY.We show that the resulting LOIII,88, for a given star formation rate, is slightly higher than predicted from the empirical relation for local galaxies, and is consistent with recent observations of galaxies at redshifts 7-9. Bright [O III] emitters with LOIII,88 > 108 L have star formation rates higher than 3M yr-1, and the typical metallicity is ~0.1Z. The galaxies are hosted by dark matter haloes with masses greater than 1011M. We propose to use the [OIII] 5007Å line, to be detected by James Webb Space Telescope, to study the properties of galaxies whose [OIII] 88 μm line emission has been already detected with ALMA.

Original languageEnglish
Pages (from-to)L84-L88
JournalMonthly Notices of the Royal Astronomical Society: Letters
Issue number1
Publication statusPublished - 2018 Nov 21
Externally publishedYes


  • Galaxies: ISM
  • Galaxies: evolution
  • Galaxies: high-redshift

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science


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