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.

doi:10.1093/mnras/stw936

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.

Authors

A.L. Tiley

J.P. Stott

Professor Mark Swinbank a.m.swinbank@durham.ac.uk
Professor

M. Bureau

C.M. Harrison

R. Bower

H.L. Johnson

A.J. Bunker

M.J. Jarvis

G. Magdis

Professor Ray Sharples r.m.sharples@durham.ac.uk
Professor

Professor Ian Smail ian.smail@durham.ac.uk
Emeritus Professor

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

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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.