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SUMMARY:A cosmic ballet of dwarf galaxies as challenge for cosmology - Oli
 ver Müller (EPFL)
DTSTART:20250228T113000Z
DTEND:20250228T123000Z
UID:TALK226300@talks.cam.ac.uk
CONTACT:Sandro Tacchella
DESCRIPTION:Dwarf galaxies are crucial to constrain cosmological models\, 
 as they are the most dark matter dominated objects in the universe. They a
 re 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 Loc
 al Group. This is an open issue\, because several tensions between observa
 tions of dwarf galaxies within the Local Group and our standard model of c
 osmology have been identified (e.g. Sales et al. 2021\, Nature Astronomy) 
 and comparison samples are needed. Among these tension is the plane-of-sat
 ellites problem\, which describes that the distribution and motion of dwar
 f galaxies is at odds with cosmological simulations (e.g. Ibata et al. 201
 3\, Nature). It is therefore crucial to extend such studies to other nearb
 y 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 e
 xpect in the future with space telescope missions such Euclid and ARRAKIHS
 .
LOCATION:Ryle Seminar Room\, KICC + online
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