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Abstract: We compare six popularly used evolutionary population synthesis EPS modelsBC03, CB07, Ma05, GALEV, GRASIL, Vazdekis-Miles through fitting the fulloptical spectra of six representative types of galaxies star-forming andcomposite galaxies, Seyfert 2s, LINERs, E+A and early-type galaxies, which aretaken from the Sloan Digital Sky Survey SDSS. Throughout our paper, we usethe simple stellar populations SSPs from each EPS model and the softwareSTARLIGHT to do our fits. Our main results are: Using different EPS models theresulted numerical values of contributed light fractions change obviously, eventhough the dominant populations are consistent. The stellar populationsynthesis does depend on the selection of age and metallicity, while it doesnot depend on the stellar evolution track much. The importance of youngpopulations decreases from star-forming, composite, Seyfert 2, LINER toearly-type galaxies, and E+A galaxies lie between composite galaxies andSeyfert 2s in most cases. We conclude that different EPS models do derivedifferent stellar populations, so that it is not reasonable to directly comparestellar populations estimated from different EPS models. To get reliableresults, we should use the same EPS model for the compared samples.



Autor: X. Y. Chen, Y. C. Liang, F. Hammer, Ph. Prugniel, G. H. Zhong, M. Rodrigues, Y. H. Zhao, H. Flores

Fuente: https://arxiv.org/







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