I present a model for the star formation properties of z \sim 2 starburst galaxies .
Here , I discuss models for the formation of high- z Submillimeter Galaxies , as well as the CO-H _ { 2 } conversion factor for these systems .
I then apply these models to literature observations .
I show that when using a functional form for X _ { CO } that varies smoothly with the physical properties in galaxies , galaxies at both local and high- z lie on a unimodal Kennicutt-Schmidt star formation law , with power-law index of \sim 2 .
The inferred gas fractions of these galaxies are large ( f _ { gas } \sim 0.2 - 0.4 ) , though a factor \sim 2 lower than most literature estimates that utilize locally-calibrated CO-H _ { 2 } conversion factors .