Detections of [Oiii] 88 μm in two quasars in the reionization epoch

Takuya Hashimoto, Akio K. Inoue, Yoichi Tamura, Hiroshi Matsuo, Ken Mawatari, Yuki Yamaguchi

Research output: Contribution to journalArticlepeer-review


With the Atacama Large Millimeter/sub-millimeter Array (ALMA), we report detections of the far-infrared (FIR) [Oiii] 88 μm line and the underlying dust continuum in the two quasars in the reionization epoch, J205406.48-000514.8 (hereafter J2054-0005) at z = 6.0391± 0.0002 and J231038.88+185519.7 (hereafter J2310+1855) at z = 6.0035±0.0007. The [Oiii] luminosity of J2054-0005 and J2310+1855 are L[OIII]=(6.8±0.6)×109and (2.4±0.6)×109L⊙, corresponding to ≈ 0.05% and 0.01% of the total infrared luminosity, LTIR, respectively. Combining these [Oiii] luminosities with [Cii] 158 μm luminosities in the literature, we find that J2054-0005 and J2310+1855 have the [Oiii]-to-[Cii] luminosity ratio of 2.1±0.4 and 0.3±0.1, respectively, the latter of which is the lowest among objects so far reported at z > 6. Combining [Oiii] observations at z ≈ 6-9 from our study and the literature, we identify the [Oiii] line deficit: objects with larger LTIRhave lower L[OIII]-to-LTIRratios. Furthermore, we also find that the anti-correlation is shifted toward higher LTIRvalue when compared to the local [Oiii] line deficit.

Original languageEnglish
JournalUnknown Journal
Publication statusPublished - 2018 Oct 31


  • Galaxies: Active
  • Galaxies: High-redshift
  • Galaxies: ISM
  • Quasars: General

ASJC Scopus subject areas

  • General

Fingerprint Dive into the research topics of 'Detections of [Oiii] 88 μm in two quasars in the reionization epoch'. Together they form a unique fingerprint.

Cite this