Breathless BEARS: [Oiii] 88µm emission of dusty star-forming galaxies at z = 3−4
Artikel i vetenskaplig tidskrift, 2026
We present [O iii] 88 μm observationstowardsfour Herschel-selected dusty star-forming galaxies(DSFGs; log10 μLIR /L☉ = 13.5–14 at z = 2.9–4) using the Atacama Compact Array (ACA) in Bands 9 and 10. We detect [O iii] emission in all four targets at > 3σ, finding line luminosity ratios (L[OIII] /LIR = 10−4.2 to 10−3) similar to local spiral galaxies, and an order of magnitude lower when compared with local dwarf galaxies as well as high-redshift Lyman-break galaxies. Using the short-wavelength capabilities of the ACA, these observations bridge the populations of galaxies with [O iii] emission at low redshift from space missions and at high redshift from ground-based studies. The difference in [O iii] emission between these DSFGs and other high-redshift galaxies reflects their more evolved stellar populations (>10 Myr), larger dustreservoirs(Mdust ∼ 109−11 M☉ ), metal-rich interstellar medium (Z ∼ 0.5–2 Z☉ ), and likely weakerionization radiation fields. Ancillary [C ii] emission on two targets provide L[O iii] /L[C ii] ratios at 0.3–0.9, suggesting that ionized gas represents a smaller fraction of the total gas reservoir in DSFGs, consistent with theoretical models of DSFGs as transitional systems between gas-rich, turbulent disks and more evolved, gas-poor galaxies. Expanding samples of DSFGs with [O iii] emission will be key to place this heterogeneous, poorly understood galactic phase in its astrophysical context.
submillimetre: galaxies
galaxies: ISM
galaxies: high-redshift
Författare
Tom Bakx
Chalmers, Rymd-, geo- och miljövetenskap, Astronomi och plasmafysik
H. Algera
Academia Sinica
Prachi Prajapati
Max-Planck-Gesellschaft
Universität zu Köln
G. J. Bendo
University of Manchester
S. Berta
Institut de Radioastronomie Millimétrique (IRAM)
L. Bonavera
Universidad de Oviedo
ICTEA
P. Cox
Institut d 'Astrophysique de Paris
J. González-Nuevo
ICTEA
Universidad de Oviedo
Masato Hagimoto
Nagoya University
K. C. Harrington
Universidad Diego Portales
European Southern Observatory Santiago
National Astronomical Observatory of Japan
Atacama Large Millimeter-submillimeter Array (ALMA)
M. Lehnert
Université de Lyon
Institut d 'Astrophysique de Paris
S. Serjeant
The Open University
P. Temi
National Aeronautics and Space Administration (NASA)
P. van der Werf
Universiteit Leiden
Chentao Yang
Chalmers, Rymd-, geo- och miljövetenskap, Astronomi och plasmafysik
G. De Zotti
Istituto nazionale di astrofisica (INAF)
Monthly Notices of the Royal Astronomical Society
0035-8711 (ISSN) 1365-2966 (eISSN)
Vol. 546 3 stag106Ämneskategorier (SSIF 2025)
Astronomi, astrofysik och kosmologi
DOI
10.1093/mnras/stag106