Formación de cúmulos globulares en escenarios de agregación jerárquica

PELLIZZA GONZÁLEZ, L. J.; TISSERA, P. B.; FORTE, J. C.; GARCÍA LAMBAS, D.

La Plata, Argentina

Congreso; 46a. Reunión de la Asociación Argentina de Astronomía; 2003

Asociación Argentina de Astronomía

In this work we continued the study of the formation of globular clusters in hierarchical clustering scenarios presented by Pellizza González et al. (2002). We used numerical hydrodynamical simulations of structure formation which include star formation and chemical enrichment by type Ia and II supernovae in a cosmological framework (Tissera, García Lambas & Abadi 1997, Tissera et al. 2001, Mosconi et al. 2001), and which describe the formation of galactic-like objects. Analysing the star formation history of the simulations we investigated the presence of stellar populations with the astrophysical properties of globular cluster ones (old and metal-poor). We found that these populations statistically correlate with the occurrence of starbursts with high star formation efficiency (collapses, mergers) and in which massive gas clouds are present. Simulated globular clusters in each galactic-like object show in some cases bimodal colour distributions similar to those observed in real galaxies. It is also possible to reproduce the observed correlation between the total mass in globular clusters in a galaxy and the luminosity of the galaxy. We analysed the origin of these properties and their relationship to the star formation and merger histories of galactic-like objects.