Protogalactic Disk Models of Damped Lyα Kinematics

We present new observational results on the kinematics of the damped Lya systems. Our full sample now comprises 31 low-ion proles and exhibits characteristics similar to those of the sample from our previous paper.The primary exception is that the new distribution of velocity widths includes values out to a maximum of nearly 300 km s~1, B100 km s~1 greater than the previous maximum. These high velocity width systems will signicantly leverage models introduced to explain the damped Lya systems. Comparing the characteristics from low-redshift and high-redshift subsamples, we nd no evidence for signicant evolution in the kinematic properties of protogalaxies from z \ 2.0 to z \ 3.3.