By Jose Afonso, Nuno Santos, Andre Moitinho, Rui Agostinho
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Additional resources for 2005: Past Meets Present in Astronomy And Astrophysics: Proceedings of the 15th Portuguese National Meeting
65. 56, from a total of 54 measured redshifts. 3. Stellar population synthesis We have used a population synthesis analysis to determine the stellar content (or evolutionary stage) of cluster galaxies at different radial distances from the cluster centre. Field galaxies, observed and analyzed in the same way, provide the term of comparison to deduce the impact of cluster environmental effects on the evolution of their member galaxies. To compute the stellar content, we performed a stellar population synthesis by means of a mathematical algorithm that gives a unique solution 6 .
It considers a galaxy as being made up of a set of stars of different spectral types, luminosity classes and metallicities. This composition will carry its own signature in the EWs of the absorption features. The method defines the galaxy composition by reproducing its signature as closely as possible, taking into account all EWs in the galaxy spectrum. This is done by matching the observed EWs of the galaxy with the stellar EWs of a combination of stars (by the least squares method). The stellar database used in this work was compiled from the Pickles stellar library 7 which gathers 131 stellar spectra of every spectral type and luminosity class from 1150 to 10620 A and R = 500, including some metalrich and metal-poor stars.
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2005: Past Meets Present in Astronomy And Astrophysics: Proceedings of the 15th Portuguese National Meeting by Jose Afonso, Nuno Santos, Andre Moitinho, Rui Agostinho