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The KMOS Redshift One Spectroscopic Survey (KROSS) is an ESO guaranteed timesurvey of 795 typical star-forming galaxies in the redshift range z=0.8-1.0with the KMOS instrument on the VLT. In this paper we present resolvedkinematics and star formation rates for 584 z~1 galaxies. This constitutes thelargest near-infrared Integral Field Unit survey of galaxies at z~1 to date. Wedemonstrate the success of our selection criteria with 90% of our targets foundto be Halpha emitters, of which 81% are spatially resolved. The fraction of theresolved KROSS sample with dynamics dominated by ordered rotation is found tobe 83$\pm$5%. However, when compared with local samples these are turbulentdiscs with high gas to baryonic mass fractions, ~35%, and the majority areconsistent with being marginally unstable (Toomre Q~1). There is no strongcorrelation between galaxy averaged velocity dispersion and the total starformation rate, suggesting that feedback from star formation is not the originof the elevated turbulence. We postulate that it is the ubiquity of high(likely molecular) gas fractions and the associated gravitational instabilitiesthat drive the elevated star-formation rates in these typical z~1 galaxies,leading to the ten-fold enhanced star-formation rate density. Finally, bycomparing the gas masses obtained from inverting the star-formation law withthe dynamical and stellar masses, we infer an average dark matter to total massfraction within 2.2$r_e$ (9.5kpc) of 65$\pm$12%, in agreement with the resultsfrom hydrodynamic simulations of galaxy formation.

The KMOS Redshift One Spectroscopic Survey (KROSS): Dynamical properties, gas and dark matter fractions of typical z~1 star-forming galaxies