A Robust Method for the Analysis of Integrated Spectra from Globular Clusters using Lick Indices

We define a method for analysis of the integrated spectra of extra-galactic globular clusters that provides more reliable measures of age, metallicity and α-element abundance ratio than have so far been achieved. The method involves the simultaneous fitting of up to 25 Lick indices in a χ-fitting technique that maximises the use of the available data. Here… CONTINUE READING