Population Synthesis of Elliptical Galaxies: the build of a library of single stellar populations using the SEGUE database.

• Grant number: 11/01889-6
• Support Opportunities: Scholarships in Brazil - Master
• Effective date (Start): March 01, 2012
• Effective date (End): March 31, 2013
• Field of knowledge: Physical Sciences and Mathematics - Astronomy - Extragalactic Astrophysics
• Principal Investigator: Thais Eunice Pires Idiart
• Grantee: Fellipy Dias Silva
• Host Institution: Instituto de Astronomia, Geofísica e Ciências Atmosféricas (IAG). Universidade de São Paulo (USP). São Paulo , SP, Brazil

Abstract

In Idiart et al. (2007) was developed a chemical evolutionary model for a sample of elliptical galaxies with zero redshift. In this work was discussed the resulting mean ages and mean abundances of ellipcals stellar populations, considering distinct methodologies. It was stressed the nedd of evolutive multipopulation model for a more realistic interpretation of the observed properties in ellipticals. One of the most important results was the introduction of a down-sizing effect in the galaxies formation, for a better simultaneous fitting of color and spectral indices diagrams.In this project we aims to improve the chemical evolutionary model in the simple population (SP) synthesis, as much as the chemical evolution physics. The first part of the project will consists in a compilation of a extended and more complete stellar database provided by SEGUE database (Sloan Extension for Galactic Understanding and Exploration), and a computation of a new empirical functions for a SP synthesis. The second objective will be the introduction of dark matter and AGN phase in the chemical evolution model. The predicted results as mean ages and abundances of stellar populations, star formation histories, time scale of galaxy formation, hot and cold gas mass fractions will be analysed. In addition we intend to examine the dependence of feedback and the down-sizing effect.