Simulations to study the dependence of the stellar population of the galaxy on the measurement of its velocity dispersion. We plot the relative offsets found between the measured σ and the velocity dispersion introduced in the simulated galaxy as a function of the S/N. In both panels a typical σ of 40 km s-1 has been considered. In the upper panel we fix the metallicity of the galaxy to −0.4 and study the influence of the age on the velocity dispersion. In the lower panel the parameter fixed is the age to 4 Gyr to analyse the influence of the metallicity on σ.
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