The large-scale dependence of star formation time-scale in galaxy groups

LUPARELLO, H. E; LARES, M; YARYURA, C. Y.; DANTE J. PAZ; NELSON PADILLA; LAMBAS, DIEGO G.

Córdoba

Conferencia; 57° Reunión Anual de la Asociación Argentina de Astronomía; 2014

Asociación Argentina de Astronomía

We analyse properties of galaxy groups and study their dependence on the large-scale environment, as defined by future virialized structures (FVS). We find that groups within global large-scaleoverdensities have a larger stellar mass content, and a systematically older stellar population. The star formation rate and stellar mass profile of the groups residing in superstructures also differ from groups elsewhere. The combination of these effects support an assembly bias scenario, indicating that groups in superstructures formed earlier. Also, the brightest group galaxies show greater differences than less luminous galaxies.