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Bright Beacons?: ALMA Non-detection of a Supposedly Bright [O i ] 63 μ m Line in a Redshift-6 Dusty Galaxy

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  • Matus Rybak
  • L. Lemsom
  • A. Lundgren
  • J. Zavala
  • J. A. Hodge
  • C. de Breuck
  • C. M. Casey
  • R. Decarli
  • K. Torstensson
  • J. L. Wardlow
  • P. P. van der Werf
Article number188
<mark>Journal publication date</mark>4/09/2023
<mark>Journal</mark>Research Notes of the AAS
Issue number9
Publication StatusPublished
<mark>Original language</mark>English


We report a non-detection of the [O i] 63 μm emission line from the z = 6.03 galaxy G09.83808 using ALMA Band 9 observations, refuting the previously claimed detection with APEX by Rybak et al.; the new upper limit on the [O i] 63 μm flux is almost 20-times lower. [O i] 63 μm line could be a powerful tracer of neutral gas in the Epoch of Reionization: yet our null result shows that detecting [O i] 63 μm from z ≥ 6 galaxies is more challenging than previously hypothesized.