Recent work on the galaxy-to-halo size relation that leverage a physically-motivated definition of galaxy size will be presented in the first part of the talk. I will show that the correlation between halo and galaxy sizes can be predicted with extremely low scatter. The second part will be dedicated to comparing observations with simulations, focusing on the methodology and the underlying significance. Simulations are calibrated to fit a set of observables, and from this, we gain insights into other observables and their evolution with time. However, we learn not only when simulations are successful, but even more so when they fail.
Contact local & organisation : Emanuele DADDI
DAp