Interpreting Integrated Spectra
Bright galaxies in clusters covering the redshift range 0 < z < 0.4 have been synthesised with a set of composite spectra based on VandenBerg’s isochrones. All fits require some distribution of stellar colours around the main sequence turnoff; if this intrinsic width is interpreted as being due purely to metallicity distribution, then the mean metallicity around the main sequence turnoff is lower than that on the giant branch. Optimal fits are interpreted as requiring a distribution of ages as well as of metallicity. First results indicate no firm trend of age distribution with redshift however, indicating that most stars formed in these cluster dominating galaxies before the lookback time appropriate to z=0.4.
KeywordsGlobular Cluster Main Sequence Stellar Population Population Synthesis Bright Galaxy
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