Gas conditions of a star-formation selected sample in the first billion years
Journal article, 2024

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.

galaxies: ISM

galaxies: high-redshift

galaxies: star formation

Author

Tom Bakx

Chalmers, Space, Earth and Environment, Astronomy and Plasmaphysics

H. Algera

National Astronomical Observatory of Japan

Hiroshima University

B. Venemans

Leiden University

Laura Sommovigo

Flatiron Institute

S. Fujimoto

The University of Texas at Austin

S. Carniani

Scuola Normale Superiore di Pisa

Masato Hagimoto

Nagoya University

Takuya Hashimoto

University of Tsukuba

Akio K. Inoue

Waseda University

Dragan Salak

Hokkaido University

S. Serjeant

Open University

L. Vallini

Istituto nazionale di astrofisica (INAF)

S. Eales

Cardiff University

Andrea Ferrara

Scuola Normale Superiore di Pisa

Yoshinobu Fudamoto

Chiba University

Chihiro Imamura

Nagoya University

Shigeki Inoue

Hokkaido University

Kirsten Knudsen

Hokkaido University

Hiroshi Matsuo

National Astronomical Observatory of Japan

The Graduate University for Advanced Studies (SOKENDAI)

Yuma Sugahara

National Astronomical Observatory of Japan

Waseda University

Y. Tamura

Nagoya University

Akio Taniguchi

Nagoya University

Satoshi Yamanaka

National Institute of Technology, Toba College

Monthly Notices of the Royal Astronomical Society

00358711 (ISSN) 13652966 (eISSN)

Vol. 532 2 2270-2288

Subject Categories

Astronomy, Astrophysics and Cosmology

Probability Theory and Statistics

Condensed Matter Physics

DOI

10.1093/mnras/stae1613

More information

Latest update

8/7/2024 1