TY - JOUR

T1 - The KMOS Deep Survey (KDS) I

T2 - Dynamical measurements of typical star-forming galaxies at z $\simeq$ 3.5

AU - Turner, O. J.

AU - Cirasuolo, M.

AU - Harrison, C. M.

AU - McLure, R. J.

AU - Dunlop, J. S.

AU - Swinbank, A. M.

AU - Johnson, H. L.

AU - Sobral, D.

AU - Matthee, J.

AU - Sharples, R. M.

N1 - 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

PY - 2017/10/21

Y1 - 2017/10/21

N2 - 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.

AB - 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.

KW - astro-ph.GA

U2 - 10.1093/mnras/stx1366

DO - 10.1093/mnras/stx1366

M3 - Journal article

VL - 471

SP - 1280

EP - 1320

JO - Monthly Notices of the Royal Astronomical Society

JF - Monthly Notices of the Royal Astronomical Society

SN - 0035-8711

IS - 2

ER -