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 2270-2288Subject Categories
Astronomy, Astrophysics and Cosmology
Probability Theory and Statistics
Condensed Matter Physics
DOI
10.1093/mnras/stae1613