Year: 2018
Type: article
Abstract: We present deep observations of a z = 1.4 massive, star-forming galaxy (SFG) in molecular and ionized gas at comparable spatial resolution (CO 3–2, NOrthern Extended Millimeter Array (NOEMA); Hα, Large Binocular Telescope (LBT)). The kinematic tracers agree well, indicating that both gas phases are subject to the same gravitational potential and physical processes affecting the gas dynamics. We combine the one-dimensional velocity and velocity dispersion profiles in CO and Hα to forward-model the galaxy in a Bayesian framework, combining a thick exponential disk, a bulge, and a dark matter halo. We determine the dynamical support due to baryons and dark matter, and find a dark matter fraction within one effective radius of f DM ( ≤ R e ) = 0.18 − 0.04 + 0.06 . Our result strengthens the evidence for strong baryon-dominance on galactic scales of massive z ∼ 1–3 SFGs recently found based on ionized gas kinematics alone.
Authors: H. Übler, R. Genzel, L. J. Tacconi, N. M. Förster Schreiber, R. Neri, A. Contursi, S. Belli, E. J. Nelson, P. Lang, T. T. Shimizu, R. Davies, R. Herrera-Camus, D. Lutz, P. M. Plewa, S. H. Price, K. Schuster, A. Sternberg, K. Tadaki, E. Wisnioski, S. Wuyts
Institutions: Max Planck Institute for Extraterrestrial Physics, University of California, Berkeley, Institut de Radioastronomie Millimétrique, Max Planck Institute for Astronomy, Tel Aviv University, Flatiron Institute, National Astronomical Observatory of Japan, Australian National University, University of Bath
Language: English
Subfield: Astronomy and Astrophysics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: bronze
OpenAlex ID: W2787033652