The kinematics of massive high-redshift dusty star-forming galaxies
Journal article, 2025
We present a new method for modelling the kinematics of galaxies from interferometric observations by performing the optimization of the kinematic model parameters directly in visibility space instead of the conventional approach of fitting velocity fields produced with the CLEAN algorithm in real-space. We demonstrate our method on Atacama Large Millimeter/submillimeter Array (ALMA) observations of12CO (2−1), (3−2), or (4−3) emission lines from an initial sample of 30 massive 850 μmselected dusty star-forming galaxies with far-infrared luminosities 1012 L in the redshift range z ∼ 1.2–4.7. Using the results from our modelling analysis for the 12 of the 20 sources with the highest signal-to-noise emission lines that show disc-like kinematics, we conclude the following: (i) our sample prefers a CO-to-H2 conversion factor, of αCO = 0.74 ± 0.37; (ii) these far-infrared luminous galaxies follow a similar Tully–Fisher relation between the circular velocity, Vcirc, and baryonic mass, Mb, as less strongly star-forming samples at high redshift, but extend this relation to much higher masses – showing that these are some of the most massive disc-like galaxies in the Universe; (iii) finally, we demonstrate support for an evolutionary link between massive high-redshift dusty star-forming galaxies and the formation of local early-type galaxies using the both the distributions of the baryonic and kinematic masses of these two populations on the Mb – σ plane and their relative space densities.
galaxies: evolution
submillimetre: galaxies
galaxies: kinematics and dynamics
galaxies: high-redshift
Author
A. Amvrosiadis
Durham University
J. L. Wardlow
Lancaster University
Jack E. Birkin
Durham University
Texas A&M University
I. Smail
Durham University
A. M. Swinbank
Durham University
James W. Nightingale
Durham University
F. Bertoldi
University of Bonn
W. N. Brandt
Pennsylvania State University
Eberly College of Science
Caitlin M. Casey
University of Texas
S.C. Chapman
Dalhousie University
C. C. Chen
Academia Sinica
P. Cox
Institut d 'Astrophysique de Paris
E. da Cunha
University of Western Australia
ARC Centre of Excellence for All Sky Astrophysics in 3 Dimensions (ASTRO 3D)
Australian National University
H. Dannerbauer
University of La Laguna
Instituto de Astrofísica de Canarias
U. Dudzeviciute
Max Planck Society
Durham University
Bitten Gullberg
Chalmers, Space, Earth and Environment, Astronomy and Plasmaphysics
J. Hodge
Leiden University
Kirsten Knudsen
Chalmers, Space, Earth and Environment, Astronomy and Plasmaphysics
K. Menten
Max Planck Society
F. Walter
Max Planck Society
P. van der Werf
Leiden University
Monthly Notices of the Royal Astronomical Society
00358711 (ISSN) 13652966 (eISSN)
Vol. 536 4 3757-3783Subject Categories (SSIF 2025)
Atom and Molecular Physics and Optics
Astronomy, Astrophysics, and Cosmology
DOI
10.1093/mnras/stae2760
Related datasets
URI: https://almascience.eso.org/asax/