Detection of an oxygen emission line from a high-redshift galaxy in the reionization epoch

Akio K. Inoue*, Yoichi Tamura, Hiroshi Matsuo, Ken Mawatari, Ikkoh Shimizu, Takatoshi Shibuya, Kazuaki Ota, Naoki Yoshida, Erik Zackrisson, Nobunari Kashikawa, Kotaro Kohno, Hideki Umehata, Bunyo Hatsukade, Masanori Iye, Yuichi Matsuda, Takashi Okamoto, Yuki Yamaguchi

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

143 Citations (Scopus)


The physical properties and elemental abundances of the interstellarmedium in galaxies during cosmic reionization are important for understanding the role of galaxies in this process.We report the AtacamaLarge Millimeter/submillimeterArray detection of an oxygen emission line at awavelength of 88 micrometers froma galaxy at an epoch about 700million years after the Big Bang.The oxygen abundance of this galaxy is estimated at about one-tenth that of the Sun.The nondetection of farinfrared continuum emission indicates a deficiency of interstellar dust in the galaxy.Acarbon emission line at a wavelength of 158micrometers is also not detected, implying an unusually small amount of neutral gas.These properties might allow ionizing photons to escape into the intergalacticmedium.

Original languageEnglish
Pages (from-to)1559-1562
Number of pages4
Issue number6293
Publication statusPublished - 2016 Jun 24
Externally publishedYes

ASJC Scopus subject areas

  • General


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