The KMOS Redshift One Spectroscopic Survey (KROSS):the Tully-Fisher Relation at z ~ 1

Tiley, Alfred L. and Stott, John and Swinbank, A. M. and Bureau, Martin and Harrison, Chris M. and Bower, Richard and Johnson, Helen L. and Bunker, Andrew J. and Jarvis, Matt J. and Magdis, Georgios and Sharples, Ray and Smail, Ian and Sobral, David and Best, Philip (2016) The KMOS Redshift One Spectroscopic Survey (KROSS):the Tully-Fisher Relation at z ~ 1. Monthly Notices of the Royal Astronomical Society, 460 (1). pp. 103-129. ISSN 0035-8711

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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 criterionV80/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.

Item Type: Journal Article
Journal or Publication Title: Monthly Notices of the Royal Astronomical Society
Additional Information: This is a pre-copy-editing, author-produced PDF of an article accepted for publication in Monthly Notices of the Royal Astronomical Society following peer review. The definitive publisher-authenticated version Alfred L. Tiley, John P. Stott, A. M. Swinbank, Martin Bureau, Chris M. Harrison, Richard Bower, Helen L. Johnson, Andrew J. Bunker, Matt J. Jarvis, Georgios Magdis, Ray Sharples, Ian Smail, David Sobral, Philip Best; The KMOS Redshift One Spectroscopic Survey (KROSS): the Tully–Fisher relation at z ∼ 1. MNRAS 2016; 460 (1): 103-129. doi: 10.1093/mnras/stw936 is available online at: https://academic.oup.com/mnras/article-lookup/doi/10.1093/mnras/stw936
Uncontrolled Keywords: /dk/atira/pure/subjectarea/asjc/1900/1912
Subjects:
Departments: Faculty of Science and Technology > Physics
ID Code: 80374
Deposited By: ep_importer_pure
Deposited On: 12 Jul 2016 10:24
Refereed?: Yes
Published?: Published
Last Modified: 19 Oct 2019 00:47
URI: https://eprints.lancs.ac.uk/id/eprint/80374

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