Speaker
Description
With the advent of next-generation radio observations, HI Galaxy surveys will be able to probe the late-time Universe with unprecedented sensitivity, offering the possibility to constraint cosmology in a complementary manner to standard spectroscopic surveys.
In preparation for this innovative scientific case, realistic simulations of large-sky volumes with good resolution are needed. In this talk I will discuss Semi-analytical models (SAM) that combine the advantages of relatively large box sizes and resolutions fine enough to resolve galaxy substructures. In particular, I will present a study of HI galaxies 21cm lines based on the state-of-the-art Galaxy Evolution and Assembly (GAEA) SAM. We employ the characteristic double-peak feature of the 21cm lines to obtain predictions for the HI Tully Fisher relation and validate the simulation by comparing to observations and exploring systematic effects. These type of study are key for understanding the realistic constraining power of peculiar velocity surveys with the SKAO. I will thus conclude discussing the next challenges and the roadmap for the future.
