2016MNRAS.460..103T

We present the stellar mass (M_*), and K-corrected K-band absolute magnitude (M_K) 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, V_80 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 V_80/σ > 3, where σ is the flux weighted average velocity dispersion. We find the M_K and M_* TFRs for this subsample to be M_{K}/ {mag}= (-7.3 ±0.9) ×[(log(V_{80}/{km s^{-1}})-2.25]- 23.4 ±0.2, and log(M_{*}/ M_{☉})= (4.7 ±0.4) ×[(log(V_{80}/{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 M_K 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.