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A new formation and evolution scenario of the the Local Group dwarf galaxies

Sylvain Fouquet

Évènements associés

  • Le lundi 18 mars 2013 de 11:00 à 12:00

Since more than 10 years, the knowledge of the Local Group and especially of its dwarf galaxies has been quickly developed. Some surveys like the SDSS or the PAndAS survey have discovered new dwarf galaxies around the MW and M31. New instruments like the VLT, the KECK and the HST have allowed to resolve the stars of the dwarf galaxies in order to determine their distance, velocity, star formation history, etc. In parallel, the cosmological simulations manage to reach high resolution which allow to make predictions on the dwarf galaxy state in the environnement of L* galaxies, like the MW.

Several critical incompatibilities arise between the cosmological simulations and the observations, like the famous « missing satellite problem ». To resolve this problem and matching the new observations, I suggest a new scenario of the formation and evolution of the Local Group dwarf galaxies. In this scenario, the dwarf galaxies are not remnants of primordial galaxies but remnants of tidal dwarf galaxies ejected by a major merger which would have produced M31.

During my talk, I will use 3D animation to better visualize the spatial distribution of the dwarf galaxies. Bring your 3D glasses if you have them. If you do not have, I will provide them