Abstract

Dwarf galaxies are crucial to constrain cosmological models, as they are the most dark matter dominated objects in the universe. They are located at the faint end of galaxy mass function and are thought to be the building blocks of larger structures. Due to their small size and low baryonic mass, they are intrinsically difficult to detect outside the Local Group. This is an open issue, because several tensions between observations of dwarf galaxies within the Local Group and our standard model of cosmology have been identified (e.g. Sales et al. 2021, Nature Astronomy) and comparison samples are needed. Among these tension is the plane-of-satellites problem, which describes that the distribution and motion of dwarf galaxies is at odds with cosmological simulations (e.g. Ibata et al. 2013, Nature). It is therefore crucial to extend such studies to other nearby galaxy groups, because the Local Group could simply be a cosmic variant. In this talk, I will present the current state of affairs and what to expect in the future with space telescope missions such Euclid and ARRAKIHS .