Galaxies, their satellites and progenitors: chemical properties

GARGIULO, I. D.; CORA, S. A.; PADILLA, N. D.

Salta

Congreso; LIII Reunión Anual de la Asociación Argentina de Astronomía; 2010

We use a model that combines N-body cosmological simulations ofgalaxy clusters and a semi-analytic model of galaxy formation (SAG:Semi-analytical galaxies; Lagos, Cora & Padilla, 2008) in order to studythe properties of galaxy progenitors, using the information provided bytheir stellar haloes, and surviving satellites at redshift z = 0. We modelthe formation of stellar haloes by considering tidal stripping events actingon the satellite galaxies before the mergers occur, being able to followtheir mass, luminosity and chemical properties. We find that the satellitegalaxies have lower metallicities than the stellar haloes of central galaxiesfor a given host DM halo mass, as has been already noted by Lagos,Padilla & Cora (2009), using a different approach.