ALMA detection of the [OIII] 88 μm line in a highly-magnified Lyman break galaxy at z = 6.1

Kaho Sunaga*, Yoichi Tamura, Minju Lee, Ken Mawatari, Akio K. Inoue, Takuya Hashimoto, Hiroshi Matsuo, Akio Taniguchi

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


We present a 4.7σ detection of the [OIII] 88 μm line in a gravitationally-lensed Lyman break galaxy, RXC J2248-ID3, using the Atacama Large Millimeter/submillimeter Array (ALMA). We did not detect [CII] 158 μm and rest-frame 90 μm dust continuum emission, suggesting that the bulk of the interstellar medium (ISM) is ionized. Our two-component SED model combining the previous Hubble Space Telescope (HST) data and new photometry obtained from Very Large Telescope (VLT), Spitzer and ALMA suggests the presence of young (∼2 Myr) and mature (∼600 Myr) stellar components with the metallicity of Z = 0.2Z . Our findings are in contrast with previous results claiming a very young, metal-poor stellar component.

Original languageEnglish
Pages (from-to)309-311
Number of pages3
JournalProceedings of the International Astronomical Union
Issue numberS341
Publication statusPublished - 2019
Externally publishedYes


  • galaxies: high-redshift

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science


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