Cake Talk by Lilian Lee
Kinematics studies at z ~ 1- 3 have established the prevalence (~70%) of regular rotating disks of star-forming galaxies. However, there is yet to be a consensus on when disks settled, as high-resolution resolved studies are only available for a few galaxies at z > 4. The ALMA large program, CRISTAL, targeted the [CII] line in a sample of 19+ massive star-forming galaxies at 4 < z < 6, providing an unprecedented clear view of the dynamical state of z > 4 star-forming galaxies. In this talk, I will present a resolved kinematic study of CRISTAL galaxies, using various criteria to classify galaxies as rotational-dominated disks, candidate mergers, and dispersion-dominated systems. Detailed rotation curves, kinematic modelling, and constraints on the mass budgets of the disks will also be discussed. These findings have important implications for understanding the build-up processes and cosmic evolution of disk turbulence of high-z galaxy populations.