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The influence of a dark component on the first epoch of galaxy formation is analysed by using the ages of the three oldest high-redshift galaxies known in the literature. Our results, based on a spatially flat accelerated Universe driven by a "quintessence" component (pₓ = \\ₓ), show that if the inferred ages of these objects are correct the first formation era is pushed back to extremely high redshifts. For the present best-fit quintessence model (\ₗ= 0. 7, \ < -0. 6), we find a lower bound of zf \ 7. 7, whereas in the extreme case of \CDM model (\ = -1) the limit is slightly smaller (zf \ 5. 8). The case for open cold dark matter models (OCDM) has also been discussed. For \ₘ \ 0. 3, the formation redshift is restricted by zf \ 18. As a general result, if \ₘ \ 0. 37, these galaxies are not formed in FRW cosmologies with no dark energy since for all these cases zf \ \.
Alcaniz et al. (Sun,) studied this question.