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The KMOS Redshift One Spectroscopic Survey (KROSS): the Tully–Fisher relation at z ∼ 1

Tiley, A.L.; Stott, J.P.; Swinbank, A.M.; Bureau, M.; Harrison, C.M.; Bower, R.; Johnson, H.L.; Bunker, A.J.; Jarvis, M.J.; Magdis, G.; Sharples, R.; Smail, I.; Sobral, D.; Best, P.

The KMOS Redshift One Spectroscopic Survey (KROSS): the Tully–Fisher relation at z ∼ 1 Thumbnail


Authors

A.L. Tiley

J.P. Stott

M. Bureau

C.M. Harrison

R. Bower

H.L. Johnson

A.J. Bunker

M.J. Jarvis

G. Magdis

D. Sobral

P. Best



Abstract

We present the stellar mass (M*), and K-corrected K-band absolute magnitude (MK) Tully–Fisher relations (TFRs) for subsamples of the 584 galaxies spatially resolved in H α emission by the KMOS Redshift One Spectroscopic Survey (KROSS). We model the velocity field of each of the KROSS galaxies and extract a rotation velocity, V80 at a radius equal to the major axis of an ellipse containing 80 per cent of the total integrated H α flux. The large sample size of KROSS allowed us to select 210 galaxies with well-measured rotation speeds. We extract from this sample a further 56 galaxies that are rotationally supported, using the stringent criterion V80/σ > 3, where σ is the flux weighted average velocity dispersion. We find the MK and M* TFRs for this subsample to be MK/mag=(−7.3±0.9)×[(log(V80/km s−1)−2.25]−23.4±0.2MK/mag=(−7.3±0.9)×[(log⁡(V80/km s−1)−2.25]−23.4±0.2, and log(M∗/M⊙)=(4.7±0.4)×[(log(V80/km s−1)−2.25]+10.0±0.3log⁡(M∗/M⊙)=(4.7±0.4)×[(log⁡(V80/km s−1)−2.25]+10.0±0.3, respectively. We find an evolution of the M* TFR zero-point of −0.41 ± 0.08 dex over the last ∼8 billion years. However, we measure no evolution in the MK TFR zero-point over the same period. We conclude that rotationally supported galaxies of a given dynamical mass had less stellar mass at z ∼ 1 than the present day, yet emitted the same amounts of K-band light. The ability of KROSS to differentiate, using integral field spectroscopy with KMOS, between those galaxies that are rotationally supported and those that are not explains why our findings are at odds with previous studies without the same capabilities.

Citation

Tiley, A., Stott, J., Swinbank, A., Bureau, M., Harrison, C., Bower, R., …Best, P. (2016). The KMOS Redshift One Spectroscopic Survey (KROSS): the Tully–Fisher relation at z ∼ 1. Monthly Notices of the Royal Astronomical Society, 460(1), 103-129. https://doi.org/10.1093/mnras/stw936

Journal Article Type Article
Acceptance Date Apr 19, 2016
Online Publication Date Apr 21, 2016
Publication Date Jul 21, 2016
Deposit Date May 24, 2016
Publicly Available Date Jun 15, 2016
Journal Monthly Notices of the Royal Astronomical Society
Print ISSN 0035-8711
Electronic ISSN 1365-2966
Publisher Royal Astronomical Society
Peer Reviewed Peer Reviewed
Volume 460
Issue 1
Pages 103-129
DOI https://doi.org/10.1093/mnras/stw936
Public URL https://durham-repository.worktribe.com/output/1404001

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Copyright Statement
This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2016 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.






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