Abstract
By modeling the rich emission line spectra of a sample of high redshift (HzRG, z\sim 2.5) radio galaxies we find that solar and supersolar metallicities are common in the extended gas of these objects. Our models and the comparison with high redshift quasars suggest that HzRG at z\sim 2.5 are associated with intense star formation activity. This is consistent with chemical evolution models for giant ellipticals and it supports the idea that distant powerful radio galaxies are progenitors of giant ellipticals. We might be witnessing different evolutive status in different objects.
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