A cosmic ballet of dwarf galaxies as challenge for cosmology

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• Oliver Müller (EPFL)
• Friday 28 February 2025, 11:30-12:30
• Ryle Seminar Room, KICC + online.

If you have a question about this talk, please contact Sandro Tacchella.

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 .

This talk is part of the Galaxies Discussion Group series.

This talk is included in these lists:

• Cambridge Astronomy Talks
• Combined External Astrophysics Talks DAMTP
• Cosmology, Astrophysics and General Relativity
• Galaxies Discussion Group
• Institute of Astronomy Talk Lists
• Kavli Institute for Cosmology Talk Lists
• Ryle Seminar Room, KICC + online

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