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KAOSS: turbulent, but disc-like kinematics in dust-obscured star-forming galaxies at z~1.3-2.6

KAOSS: turbulent, but disc-like kinematics in dust-obscured star-forming galaxies at z~1.3-2.6
KAOSS: turbulent, but disc-like kinematics in dust-obscured star-forming galaxies at z~1.3-2.6
We present spatially resolved kinematics of 27 ALMA-identified dust-obscured star-forming galaxies (DSFGs) at z ∼ 1.3–2.6, as traced by Hα emission using VLT/KMOS near-infrared integral field spectroscopy from the ‘KMOS-ALMA Observations of Submillimetre Sources’ (KAOSS) Large Programme. We derive Hα rotation curves and velocity dispersion profiles for the DSFGs, and find that among the 27 sources with bright, spatially extended Hα emission, 24 display evidence for disc-like kinematics. We measure a median inclination-corrected velocity at 2.2 Rd of vrot = 190 ± 40 km s−1 and intrinsic velocity dispersion of σ0 = 87 ± 6 km s−1 for these disc-like sources. The kinematics yield median circular velocities of vcirc = 230 ± 20 km s−1 and dynamical masses within 2Re (∼ 7 kpc radius) of Mdyn = (1.1 ± 0.2) × 1011 M⊙. Compared to less actively star-forming galaxies, KAOSS DSFGs are both faster rotating with higher intrinsic velocity dispersions, but have similar vrot/σ0 ratios, median v/σ0 = 2.5 ± 0.5. We suggest that the kinematics of the DSFGs are primarily rotation supported but with a non-negligible contribution from pressure support, which may be driven by star formation or mergers/interactions. We estimate the normalization of the stellar mass Tully–Fisher relation (sTFR) for the disc-like DSFGs and compare it with local studies, finding no evolution at fixed slope between z ∼ 2 and z ∼ 0. Finally, we show that the kinematic properties of the DSFG population are consistent with them evolving into massive early-type galaxies, the dominant z ∼ 0 population at these masses.
astro-ph.GA
1365-2966
61-83
Birkin, Jack E.
654528cc-a268-4234-8c49-554ddf4d3697
Puglisi, A.
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Swinbank, A.M.
53256483-8faf-4843-81fd-c494cb3369fb
Smail, Ian
bde55422-5add-46d9-a750-ec89f7015638
An, Fang Xia
28f6af8e-ee55-4a5d-983c-3a1a16d4c2ac
Chapman, S.C.
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Chen, Chian-Chou
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Conselice, C.J.
ddb44e19-7133-4ec3-b39d-28502f2f8e5a
Dudzevičiūtė, U.
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Farrah, D.
8ed6de23-8b72-4f38-aace-5de818bfe015
Gullberg, B.
d24e3990-920a-457a-86ea-343cee6f9581
Matsuda, Y.
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Schinnerer, E.
684d67e6-3146-4a26-86ac-43c36a2fa8ab
Scott, D.
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Wardlow, J.L.
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Werf, P. van der
d68ca67e-e29d-48b4-b1cc-a3d4fcef1cf8
Birkin, Jack E.
654528cc-a268-4234-8c49-554ddf4d3697
Puglisi, A.
97237841-1e6d-48fb-9133-671b6f3af18b
Swinbank, A.M.
53256483-8faf-4843-81fd-c494cb3369fb
Smail, Ian
bde55422-5add-46d9-a750-ec89f7015638
An, Fang Xia
28f6af8e-ee55-4a5d-983c-3a1a16d4c2ac
Chapman, S.C.
572c46c1-2575-453e-8c35-eff9abd4fcee
Chen, Chian-Chou
bf62035f-f6f4-452c-9273-ed3e81bbdb30
Conselice, C.J.
ddb44e19-7133-4ec3-b39d-28502f2f8e5a
Dudzevičiūtė, U.
a5adde4e-3602-49ab-af6a-477f159c3e34
Farrah, D.
8ed6de23-8b72-4f38-aace-5de818bfe015
Gullberg, B.
d24e3990-920a-457a-86ea-343cee6f9581
Matsuda, Y.
d9c709a4-4e5b-4152-ba9f-023666d9b194
Schinnerer, E.
684d67e6-3146-4a26-86ac-43c36a2fa8ab
Scott, D.
e767ccb9-f27d-4dac-8a8b-c598e3494f01
Wardlow, J.L.
b88eb5a4-df5c-44c2-a66b-ed531a6d6b4d
Werf, P. van der
d68ca67e-e29d-48b4-b1cc-a3d4fcef1cf8

Birkin, Jack E., Puglisi, A., Swinbank, A.M., Smail, Ian, An, Fang Xia, Chapman, S.C., Chen, Chian-Chou, Conselice, C.J., Dudzevičiūtė, U., Farrah, D., Gullberg, B., Matsuda, Y., Schinnerer, E., Scott, D., Wardlow, J.L. and Werf, P. van der (2024) KAOSS: turbulent, but disc-like kinematics in dust-obscured star-forming galaxies at z~1.3-2.6. Monthly Notices of the Royal Astronomical Society, 531 (1), 61-83. (doi:10.48550/arXiv.2301.05720).

Record type: Article

Abstract

We present spatially resolved kinematics of 27 ALMA-identified dust-obscured star-forming galaxies (DSFGs) at z ∼ 1.3–2.6, as traced by Hα emission using VLT/KMOS near-infrared integral field spectroscopy from the ‘KMOS-ALMA Observations of Submillimetre Sources’ (KAOSS) Large Programme. We derive Hα rotation curves and velocity dispersion profiles for the DSFGs, and find that among the 27 sources with bright, spatially extended Hα emission, 24 display evidence for disc-like kinematics. We measure a median inclination-corrected velocity at 2.2 Rd of vrot = 190 ± 40 km s−1 and intrinsic velocity dispersion of σ0 = 87 ± 6 km s−1 for these disc-like sources. The kinematics yield median circular velocities of vcirc = 230 ± 20 km s−1 and dynamical masses within 2Re (∼ 7 kpc radius) of Mdyn = (1.1 ± 0.2) × 1011 M⊙. Compared to less actively star-forming galaxies, KAOSS DSFGs are both faster rotating with higher intrinsic velocity dispersions, but have similar vrot/σ0 ratios, median v/σ0 = 2.5 ± 0.5. We suggest that the kinematics of the DSFGs are primarily rotation supported but with a non-negligible contribution from pressure support, which may be driven by star formation or mergers/interactions. We estimate the normalization of the stellar mass Tully–Fisher relation (sTFR) for the disc-like DSFGs and compare it with local studies, finding no evolution at fixed slope between z ∼ 2 and z ∼ 0. Finally, we show that the kinematic properties of the DSFG population are consistent with them evolving into massive early-type galaxies, the dominant z ∼ 0 population at these masses.

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Accepted/In Press date: 12 April 2024
e-pub ahead of print date: 23 April 2024
Published date: June 2024
Keywords: astro-ph.GA

Identifiers

Local EPrints ID: 490752
URI: http://eprints.soton.ac.uk/id/eprint/490752
ISSN: 1365-2966
PURE UUID: f95d5c00-43fc-4ed7-a981-2558b981224b

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Date deposited: 06 Jun 2024 16:32
Last modified: 06 Jun 2024 16:34

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Contributors

Author: Jack E. Birkin
Author: A. Puglisi
Author: A.M. Swinbank
Author: Ian Smail
Author: Fang Xia An
Author: S.C. Chapman
Author: Chian-Chou Chen
Author: C.J. Conselice
Author: U. Dudzevičiūtė
Author: D. Farrah
Author: B. Gullberg
Author: Y. Matsuda
Author: E. Schinnerer
Author: D. Scott
Author: J.L. Wardlow
Author: P. van der Werf

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