Ionized and Molecular Gas Kinematics in a z = 1.4 Star-forming Galaxy

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

doi:10.3847/2041-8213/aaacfa

Ionized and Molecular Gas Kinematics in a z = 1.4 Star-forming Galaxy

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

Department of Physics

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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 ^+0.006 _-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.

Original language	English
Article number	L24
Pages (from-to)	1-7
Number of pages	7
Journal	Astrophysical Journal Letters
Volume	854
Issue number	2
DOIs	https://doi.org/10.3847/2041-8213/aaacfa
Publication status	Published - 16 Feb 2018

Keywords

galaxies: evolution
galaxies: high-redshift
galaxies: kinematics and dynamics

ASJC Scopus subject areas

Astronomy and Astrophysics
Space and Planetary Science

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10.3847/2041-8213/aaacfa

Uebler2018_arXiv
© 2018. The American Astronomical Society. All rights reserved.
Accepted author manuscript, 1.68 MB

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Übler, H., Genzel, R., Tacconi, L. J., Schreiber, N. M. F., Neri, R., Contursi, A., Belli, S., Nelson, E. J., Lang, P., Shimizu, T. T., Davies, R., Herrera-camus, R., Lutz, D., Plewa, P. M., Price, S. H., Schuster, K., Sternberg, A., Tadaki, K., Wisnioski, E., & Wuyts, S. (2018). Ionized and Molecular Gas Kinematics in a z = 1.4 Star-forming Galaxy. Astrophysical Journal Letters, 854(2), 1-7. Article L24. https://doi.org/10.3847/2041-8213/aaacfa

Übler, H, Genzel, R, Tacconi, LJ, Schreiber, NMF, Neri, R, Contursi, A, Belli, S, Nelson, EJ, Lang, P, Shimizu, TT, Davies, R, Herrera-camus, R, Lutz, D, Plewa, PM, Price, SH, Schuster, K, Sternberg, A, Tadaki, K, Wisnioski, E & Wuyts, S 2018, 'Ionized and Molecular Gas Kinematics in a z = 1.4 Star-forming Galaxy', Astrophysical Journal Letters, vol. 854, no. 2, L24, pp. 1-7. https://doi.org/10.3847/2041-8213/aaacfa

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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(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. ",

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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.

PY - 2018/2/16

Y1 - 2018/2/16

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 f DM(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 f DM(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

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JO - Astrophysical Journal Letters

JF - Astrophysical Journal Letters

IS - 2

M1 - L24

ER -

Ionized and Molecular Gas Kinematics in a z = 1.4 Star-forming Galaxy

Abstract

Keywords

ASJC Scopus subject areas

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