Evidence for strong dynamical evolution in disk galaxies through the last 11 Gyr. GHASP VIII: A local reference sample of rotating disk galaxies for high redshift studies

Understand

[Abridged] Due to their large distances, high-z galaxies are observed at a very low spatial resolution.

• In order to disentangle the evolution of galaxy kinematics from low resolution effects, we have used Fabry-Perot 3D Ha data-cubes of 153 nearby isolated galaxies from the GHASP survey to simulate data-cubes of galaxies at z=1.7.
• We show that the inner velocity gradient is lowered and is responsible for a peak in the velocity dispersion map.
• Toy-models of rotating disks have been built to recover the parameters from low resolution data.