Gas conditions of a star-formation selected sample in the first billion years

Tom J.L.C. Bakx*, Hiddo S.B. Algera, Bram Venemans, Laura Sommovigo, Seiji Fujimoto, Stefano Carniani, Masato Hagimoto, Takuya Hashimoto, Akio K. Inoue, Dragan Salak, Stephen Serjeant, Livia Vallini, Stephen Eales, Andrea Ferrara, Yoshinobu Fudamoto, Chihiro Imamura, Shigeki Inoue, Kirsten K. Knudsen, Hiroshi Matsuo, Yuma SugaharaYoichi Tamura, Akio Taniguchi, Satoshi Yamanaka

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

We present Atacama Large Millimetre/submillimetre Array (ALMA) observations of the [O iii] 88 emission of a sample of thirteen galaxies at to 7.6 selected as [C ii]-emitting companion sources of quasars. To disentangle the origins of the luminous Oxygen line in the Universe, we looked at emission-line galaxies that are selected through an excellent star-formation tracer [C ii] with star-formation rates between 9 and 162. Direct observations reveal [O iii] emission in just a single galaxy (), and a stacked image shows no [O iii] detection, providing deep upper limits on the ratios in the Universe (at). While the fidelity of this sample is high, no obvious optical/near-infrared counterpart is seen in the JWST imaging available for four galaxies. Additionally accounting for low-z CO emitters, line stacking shows that our sample-wide result remains robust: The enhanced reported in the first billion years of the Universe is likely due to the selection towards bright, blue Lyman-break galaxies with high surface star-formation rates or young stellar populations. The deep upper limit on the rest-frame 90 μm continuum emission (Jy at), implies a low average dust temperature (K) and high-dust mass (). As more normal galaxies are explored in the early Universe, synergy between JWST and ALMA is fundamental to further investigate the ISM properties of the a broad range of samples of high-z galaxies.

Original languageEnglish
Pages (from-to)2270-2288
Number of pages19
JournalMonthly Notices of the Royal Astronomical Society
Volume532
Issue number2
DOIs
Publication statusPublished - 2024 Aug 1

Keywords

  • galaxies: ISM
  • galaxies: high-redshift
  • galaxies: star formation

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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