Retorne
Título              : Chemical evolution and galaxy formation  
Conferencista: Daniel Thomas, Universitäts-Sternwarte München, Germany  
Data                : Quarta-Feira 31/01/01  
Local               : Auditório L.B.F. Clauzet - Água Funda  
Sumário         :
In models of hierarchical galaxy formation ellipticals form through the merging of smaller disk systems. Such models predict that galaxies in low-density environments form later than their counterparts in clusters, and more massive galaxies form. I am presenting simulations based on semi-analytic models that include the chemical enrichment of the elements magnesium and iron. The results are: 1) The Mg/Fe predicted for elliptical galaxies does not agree with the values derived from observations. 2) The most luminous (and massive) ellipticalss have the lowest Mg/Fe, again in conflict with the observational evidence. 3) Galaxies in looser environments exhibit lower Mg/Fe ratios. 4) Bulges are most alpha-enhanced independent of the environment.