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

Lookup NU author(s): Dr Chris HarrisonORCiD

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This is the final published version of an article that has been published in its final definitive form by Oxford University Press, 2017.

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Abstract

© 2017 The Authors. 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/σ 0 > 1) has a consistent slope and normalization as that observed for z = 0 discs. 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 discs. The specific angular momentum scales as js ∝ M* 0.6±0.2, consistent with that expected for dark matter (i.e. jDM ∝ MDM 2/3). 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 disc-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.

Publication metadata

Author(s): Harrison CM, Johnson HL, Swinbank AM, Stott JP, Bower RG, Smail I, Tiley AL, Bunker AJ, Cirasuolo M, Sobral D, Sharples RM, Best P, Bureau M, Jarvis MJ, Magdis G

Publication type: Article

Publication status: Published

Journal: Monthly Notices of the Royal Astronomical Society

Year: 2017

Volume: 467

Issue: 2

Pages: 1965-1983

Print publication date: 01/05/2017

Online publication date: 07/02/2017

Acceptance date: 23/01/2017

Date deposited: 04/02/2020

ISSN (print): 0035-8711

ISSN (electronic): 1365-2966

Publisher: Oxford University Press

URL: https://doi.org/10.1093/mnras/stx217

DOI: 10.1093/mnras/stx217

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