Alma will determine the spectroscopic redshift z > 8 with FIR [O III] emission lines

A. K. Inoue, I. Shimizu, Y. Tamura, H. Matsuo, T. Okamoto, N. Yoshida

Research output: Contribution to journalArticlepeer-review

34 Citations (Scopus)


We investigate the potential use of nebular emission lines in the rest-frame far-infrared (FIR) for determining spectroscopic redshift of z > 8 galaxies with the Atacama Large Millimeter/submillimeter Array (ALMA). After making a line emissivity model as a function of metallicity, especially for the [O III] 88 μm line which is likely to be the strongest FIR line from H II regions, we predict the line fluxes from high-z galaxies based on a cosmological hydrodynamics simulation of galaxy formation. Since the metallicity of galaxies reaches at 0.2 Z even at z > 8 in our simulation, we expect the [O III] 88 μm line as strong as 1.3 mJy for 27 AB objects, which is detectable at a high significance by <1 hr integration with ALMA. Therefore, the [O III] 88 μm line would be the best tool to confirm the spectroscopic redshifts beyond z = 8.

Original languageEnglish
Article numberL18
JournalAstrophysical Journal Letters
Issue number2
Publication statusPublished - 2014 Jan 10
Externally publishedYes


  • cosmology: observations
  • galaxies: evolution
  • galaxies: high-redshift

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science


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