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.
Professor Ian Smail email@example.com
Professor Ray Sharples firstname.lastname@example.org
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.
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|
|Publisher||Royal Astronomical Society|
|Peer Reviewed||Peer Reviewed|
|Related Public URLs||https://arxiv.org/pdf/1701.05561v2.pdf|
Published Journal Article
Accepted Journal Article
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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