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We present the spatially resolved H-alpha (Ha) dynamics of sixteenstar-forming galaxies at z~0.81 using the new KMOS multi-object integral fieldspectrograph on the ESO VLT. These galaxies were selected using 1.18 umnarrow-band imaging from the 10 deg^2 CFHT-HiZELS survey of the SA22hr field,are found in a ~4Mpc over-density of Ha emitters and likely reside in agroup/intermediate environment, but not a cluster. We confirm and identify arich group of star-forming galaxies at z=0.813+-0.003, with thirteen galaxieswithin 1000 km/s of each other, and 7 within a diameter of 3Mpc. All ourgalaxies are "typical" star-forming galaxies at their redshift, 0.8+-0.4SFR*(z=0.8), spanning a range of specific star formation rate of sSFR=0.2-1.1Gyr^-1 and have a median metallicity very close to solar of12+log(O/H)=8.62+-0.06. We measure the spatially resolved Ha dynamics of thegalaxies in our sample and show that thirteen out of sixteen galaxies can bedescribed by rotating disks and use the data to derive inclination correctedrotation speeds of 50-275 km/s. The fraction of disks within our sample is75+-8, consistent with previous results based on HST morphologies of Haselected galaxies at z~1 and confirming that disks dominate the star formationrate density at z~1. Our Ha galaxies are well fitted by the z~1-2 Tully-Fisherrelation, confirming the evolution seen in the zero-point. Apart from having,on average, higher stellar masses and lower sSFRs, our group galaxies atz=0.813 present the same mass-metallicity and TF relation as z~1 fieldgalaxies, and are all disk galaxies.

The dynamics of z=0.8 H-alpha-selected star-forming galaxies from KMOS/CF-HiZELS