Distant Disk Galaxies: Kinematics and Evolution to $z \sim 1$

Abstract.

High resolution HST images have been combined with Keck+LRIS and VLT+ISAAC spectra to study the internal kinematics of 100 faint disk galaxies in the redshift range $0.2 \le z \le 1.3$. These data form a high redshift Tully-Fisher relation that spans five magnitudes and extends to weil below L ^*, with no obvious change in shape or slope with respect to the local Tully-Fisher relation for the bulk of the observed population. The small offset of $< 0.2\ B$ mag can be attributed to strong brightening of a fraction of the low mass galaxy population at redshifts $z \ge 0.5$. A comparison of disk surface brightness between local and high redshift samples yields an offset of $< 0.3\ B$ mag, that increases smoothly with redshift and is linked to the change in the surface brightness selection function with redshift. The same effect can be seen in the apparent change in disk size with redshift for disks of a given mass. These results provide further evidence for only a modest increase in luminosity with lookback time for this population.