Abstract
For the purpose of analyzing the spectral evolution of stellar population, we derive spectral energy distributions of simple stellar population in different ages from GALAXEV. Then, from stellar populations spectra, physical parameters are obtained for observational spectra of galaxies in the wavelength range from 3200 Å to 9500 Å. We use spectral data of Coleman and Wu for plotting the spectra of four types of galaxies. These observational data are combined and averaged from different sources; also they are extrapolated to high redshifts. In addition, we plot 16 synthesized spectra by considering Salpeter Initial Mass Function (IMF), exponential and constant Star Formation Rate (SFR) and solar metallicity for all spectra. Comparing the observational spectra with stellar population spectra, we analyze the age distribution for elliptical, irregular and two types of spiral field galaxies and obtain age and time scale parameters for each.
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