The impact of galaxy formation on satellite kinematics and redshift-space distortions

Understand

Galaxy surveys aim to map the large-scale structure of the Universe and use redshift space distortions to constrain deviations from general relativity and probe the existence of massive neutrinos.

• However, the amount of information that can be extracted is limited by the accuracy of theoretical models used to analyze the data.
• Here, by using the L-Galaxies semi-analytical model run over the MXXL N-body simulation, we assess the impact of galaxy formation on satellite kinematics and the theoretical modelling of redshift-space distortions.
• We show that different galaxy selection criteria lead to noticeable differences in the radial distributions and velocity structure of satellite galaxies.