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.