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The KMOS Redshift One Spectroscopic Survey (KROSS): rotational velocities and angular momentum of z ≈ 0.9 galaxies

Harrison, C.M.; Johnson, H.L.; Swinbank, A.M.; Stott, J.P.; Bower, R.G.; Smail, I.; Tiley, A.L.; Bunker, A.J.; Cirasuolo, M.; Sobral, D.; Sharples, R.M.; Best, P.; Bureau, M.; Jarvis, M.J.; Magdis, G.

The KMOS Redshift One Spectroscopic Survey (KROSS): rotational velocities and angular momentum of z ≈ 0.9 galaxies Thumbnail


Authors

C.M. Harrison

H.L. Johnson

A.M. Swinbank

J.P. Stott

R.G. Bower

Profile image of Ian Smail

Ian Smail ian.smail@durham.ac.uk
Emeritus Professor

A.L. Tiley

A.J. Bunker

M. Cirasuolo

D. Sobral

P. Best

M. Bureau

M.J. Jarvis

G. Magdis



Abstract

We present dynamical measurements for 586 Hα detected star-forming galaxies from the KMOS (K-band Multi-Object Spectrograph) Redshift One Spectroscopic Survey (KROSS). The sample represents typical star-forming galaxies at this redshift (z = 0.6–1.0), with a median star formation rate of ≈7 M⊙ yr−1 and a stellar mass range of log (M⋆[M⊙])≈9–11. We find that the rotation velocity-stellar mass relationship (the inverse of the Tully-Fisher relationship) for our rotationally-dominated sources (VC/σ0 > 1) has a consistent slope and normalisation as that observed for z = 0 disks. In contrast, the specific angular momentum (j⋆; angular momentum divided by stellar mass), is ≈0.2–0.3 dex lower on average compared to z = 0 disks. The specific angular momentum scales as j s ∝M 0.6±0.2 ⋆ js∝M⋆0.6±0.2 , consistent with that expected for dark matter (i.e., j DM ∝M 2/3 DM jDM∝MDM2/3 ). We find that z ≈ 0.9 star-forming galaxies have decreasing specific angular momentum with increasing Sérsic index. Visually, the sources with the highest specific angular momentum, for a given mass, have the most disk-dominated morphologies. This implies that an angular momentum–mass–morphology relationship, similar to that observed in local massive galaxies, is already in place by z ≈ 1.

Citation

Harrison, C., Johnson, H., Swinbank, A., Stott, J., Bower, R., Smail, I., …Magdis, G. (2017). The KMOS Redshift One Spectroscopic Survey (KROSS): rotational velocities and angular momentum of z ≈ 0.9 galaxies. Monthly Notices of the Royal Astronomical Society, 467(2), 1965-1983. https://doi.org/10.1093/mnras/stx217

Journal Article Type Article
Acceptance Date Jan 23, 2017
Online Publication Date Feb 7, 2017
Publication Date May 21, 2017
Deposit Date Feb 2, 2017
Publicly Available Date Mar 13, 2017
Journal Monthly Notices of the Royal Astronomical Society
Print ISSN 0035-8711
Electronic ISSN 1365-2966
Publisher Royal Astronomical Society
Peer Reviewed Peer Reviewed
Volume 467
Issue 2
Pages 1965-1983
DOI https://doi.org/10.1093/mnras/stx217
Public URL https://durham-repository.worktribe.com/output/1365978
Related Public URLs https://arxiv.org/pdf/1701.05561v2.pdf

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Copyright Statement
This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society © 2017 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.







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