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

Harrison, C.M. and Johnson, H.L. and Swinbank, A.M. and Stott, J.P. and Bower, R.G. and Smail, I. and Tiley, A.L. and Bunker, A.J. and Cirasuolo, M. and Sobral, D. and Sharples, R.M. and Best, P. and Bureau, M. and Jarvis, M.J. and 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). pp. 1965-1983.


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.

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Publisher 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.
Date accepted:23 January 2017
Date deposited:13 February 2017
Date of first online publication:07 February 2017
Date first made open access:No date available

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