Through extended integrations using the recently-installed deep depletion CCD on the red arm of the Keck I Low Resolution Imaging Spectrograph , we present new measurements of the resolved spectra of 70 morphologically-selected star-forming galaxies with i _ { AB } < 24.1 in the redshift range 1 \lesssim z < 1.7 .
Using the formalism introduced in Paper I of this series and available HST ACS images , we successfully recover rotation curves using the extended emission line distribution of [ O II ] 3727 Å to 2.2 times the disk scale radius for a sample of 42 galaxies .
Combining these measures with stellar masses derived from HST and ground-based near-infrared photometry enables us to construct the stellar mass Tully-Fisher relation in the time interval between the well-constructed relation defined at z \simeq 1 in Paper I and the growing body of resolved dynamics probed with integral field unit spectrographs at z > 2 .
Remarkably , we find a well-defined Tully-Fisher relation with up to 60 % increase in scatter and zero-point shift constraint of \Delta M _ { \ast } = 0.02 \pm 0.02 dex since z \sim 1.7 , compared to the local relation .
Although our sample is incomplete in terms of either a fixed stellar mass or star formation rate limit , we discuss the implications that typical star-forming disk galaxies evolve to arrive on a well-defined Tully-Fisher relation within a surprisingly short period of cosmic history .