Las Galaxias Enanas y la Red Cósmica

MARIO G. ABADI, ALEJANDRO BENITEZ-LLAMBAY

Mar del Plata

Congreso; 55 Reunión Anual de la Asociación Argentina de Astronomía; 2012

IAR

Using a cosmological numerical simulation of the Local Group formation, we identify a mechanism able to remove gas from low-mass halos, affecting dramatically their star formation histories. As the Local Group forms, matter bound to it develops an intrincate network of filaments and pancakes, which sweeps a large volume, overtaking and removing the gas of several halos, leaving their dark matter component unaffected. The gas loss is particulary pronunced for low-mass halos, which may help to explain the scarcity of dwarf galaxies observed when compared to the large number of low-mass halos expected in the LambdaCDM cosmological model.