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Accueil > Séminaires > NEAR-FIELD COSMOLOGY AND THE FIRST (...)

NEAR-FIELD COSMOLOGY AND THE FIRST STARS

Stefania Salvadori

The first stars profoundly affected the unfolding of our Universe. Their mass
distribution is unknown, but it controls the injection of energy, momentum, and newly created heavy elements into the gas, affecting subsequent star-formation along with the build-up of the first galaxies. A direct exploration of the first star formation episodes is a tremendous challenge. But in the Local Group, ancient stars can be individually resolved, providing us with the unique opportunity to indirectly study the properties of the star-forming gas during the reionization epoch, i.e. when the Universe was < 1 Gyr old. In this talk, I will review the most recent observational and theoretical findings for ancient metal-poor stars and galaxies, underlying the links with the properties of the first star-forming systems. I will present new ideas to identify the direct descendants of the first stars, to constrain the mass distribution of this "invisible" stellar population, and to link Near and Far-Field cosmology.