Star Formation History of early-type galaxies in different environments

Computer Science

Scientific paper

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Galaxies: Abundances, Galaxies: Formation, Galaxies: Elliptical And Lenticular, Galaxies: Kinematics And Dynamics.

Scientific paper

In this thesis we presented a new spectral stellar library, MILES, which contains 1003 stars covering the spectral range (3500-7500Å) at a resolution of 2.3Å (FWHM). The main motivation of this work was to provide a homogenous set of stellar spectra to be incorporated into population synthesis models. For this reason, special care has been put in the homogeneity of the spectra and in the sample selection. Using new stellar population models which incorporate this new library, we have performed a spectroscopy study of line-strength indices in a sample of 98 early-type galaxies in different environments. This analysis has revealed important differences in the star formation history of galaxies as a function of the environment. In particular, the results can be explained under a common scenario in which galaxies in dense clusters have suffered amore truncated star formation history than their counterparts in low density environments.

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