A ballet of dwarf galaxies as challenge for cold dark matter cosmology.

Dr. Oliver Muller (EPFL, Sauverny, Switzerland)

8 Maggio 2024
11:30, Aula Piazzi

Abstract:

Dwarf galaxies play a crucial role in constraining cosmological models as they represent the most dark matter-dominated objects in the universe. Positioned at the faint end of the galaxy mass function, they are believed to serve as the fundamental building blocks of larger structures. Owing to their small size and low baryonic mass, detecting them beyond the Local Group poses inherent challenges. This remains an open issue, given the identification of various tensions between observations of dwarf galaxies within the Local Group and our standard cosmological model (e.g., Sales et al., 2021, Nature Astronomy), necessitating the establishment of comparison samples. One such tension is the plane-of-satellites problem, which highlights inconsistencies in the distribution and motion of dwarf galaxies compared to cosmological simulations (e.g., Ibata et al., 2013, Nature). Therefore, it is crucial to broaden these studies to other nearby galaxy groups, as the Local Group may potentially be a unique cosmic variant. In this presentation, I will provide an overview of the current state of affairs and outline future missions (like the recently approved space telescope ARRAKIHS) which will shine a new light on these topics.

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