TY - JOUR
T1 - Ionized and Molecular Gas Kinematics in a z = 1.4 Star-forming Galaxy
AU - Übler, H.
AU - Genzel, R.
AU - Tacconi, L. J.
AU - Schreiber, N. M.Förster
AU - Neri, R.
AU - Contursi, A.
AU - Belli, S.
AU - Nelson, E. J.
AU - Lang, P.
AU - Shimizu, T. T.
AU - Davies, R.
AU - Herrera-Camus, R.
AU - Lutz, D.
AU - Plewa, P. M.
AU - Price, S. H.
AU - Schuster, K.
AU - Sternberg, A.
AU - Tadaki, K.
AU - Wisnioski, E.
AU - Wuyts, S.
N1 - Publisher Copyright:
© 2018. The American Astronomical Society. All rights reserved..
PY - 2018/2/20
Y1 - 2018/2/20
N2 - 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 fDM(e) = 0.18+0.006-0.004. 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.
AB - 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 fDM(e) = 0.18+0.006-0.004. 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.
KW - galaxies: evolution
KW - galaxies: high-redshift
KW - galaxies: kinematics and dynamics
UR - http://www.scopus.com/inward/record.url?scp=85047772461&partnerID=8YFLogxK
U2 - 10.3847/2041-8213/aaacfa
DO - 10.3847/2041-8213/aaacfa
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AN - SCOPUS:85047772461
SN - 2041-8205
VL - 854
JO - Astrophysical Journal Letters
JF - Astrophysical Journal Letters
IS - 2
M1 - L24
ER -