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Rights statement: This is a pre-copyedited, author-produced PDF of an article accepted for publication in Monthly Notices of the Royal Astronomical Society following peer review. The version of record O. J. Turner, M. Cirasuolo, C. M. Harrison, R. J. McLure, J. S. Dunlop, A. M. Swinbank, H. L. Johnson, D. Sobral, J. Matthee, R. M. Sharples; The KMOS Deep Survey (KDS) – I. Dynamical measurements of typical star-forming galaxies at z ≃ 3.5, Monthly Notices of the Royal Astronomical Society, Volume 471, Issue 2, 21 October 2017, Pages 1280–1320, https://doi.org/10.1093/mnras/stx1366 is available online at: https://academic.oup.com/mnras/article-lookup/doi/10.1093/mnras/stx1366

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The KMOS Deep Survey (KDS) I: Dynamical measurements of typical star-forming galaxies at z $\simeq$ 3.5

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• O. J. Turner
• M. Cirasuolo
• C. M. Harrison
• R. J. McLure
• J. S. Dunlop
• A. M. Swinbank
• H. L. Johnson
• D. Sobral
• J. Matthee
• R. M. Sharples
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Journal publication date 21/10/2017 Monthly Notices of the Royal Astronomical Society 2 471 41 1280-1320 Published 3/06/17 English

Abstract

We present dynamical measurements from the KMOS (K-band Multi-Object Spectrograph) Deep Survey (KDS), which is comprised of 77 typical star-forming galaxies at z $\simeq$ 3.5 in the mass range 9.0 1), with the sample average V$_{C}$/{\sigma}$_{int}$ value much smaller than at lower redshift. After carefully selecting comparable star-forming samples at multiple epochs, we find that the rotation-dominated fraction evolves with redshift with a z$^{-0.2}$ dependence. The rotation-dominated KDS galaxies show no clear offset from the local rotation velocity-stellar mass (i.e. V$_{C}$-M$_{\star}$) relation, although a smaller fraction of the galaxies are on the relation due to the increase in the dispersion-dominated fraction. These observations are consistent with a simple equilibrium model picture, in which random motions are boosted in high redshift galaxies by a combination of the increasing gas fractions, accretion efficiency, specific star-formation rate and stellar feedback and which may provide significant pressure support against gravity on the galactic disk scale.

Bibliographic note

This is a pre-copyedited, author-produced PDF of an article accepted for publication in Monthly Notices of the Royal Astronomical Society following peer review. The version of record O. J. Turner, M. Cirasuolo, C. M. Harrison, R. J. McLure, J. S. Dunlop, A. M. Swinbank, H. L. Johnson, D. Sobral, J. Matthee, R. M. Sharples; The KMOS Deep Survey (KDS) – I. Dynamical measurements of typical star-forming galaxies at z ≃ 3.5, Monthly Notices of the Royal Astronomical Society, Volume 471, Issue 2, 21 October 2017, Pages 1280–1320, https://doi.org/10.1093/mnras/stx1366 is available online at: https://academic.oup.com/mnras/article-lookup/doi/10.1093/mnras/stx1366