Dark energy and the epoch of galaxy formation

Abstract

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 ($p_x=\omega {\rho }_x$), 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 (${\Omega }_x=0.7$, $\omega <-0.6$), we find a lower bound of $z_f\ge 7.7$, whereas in the extreme case of $\Lambda$CDM model ($\omega =-1$) the limit is slightly smaller ($z_f\ge 5.8$). The case for open cold dark matter models (OCDM) has also been discussed. For ${\Omega }_m\simeq 0.3$, the formation redshift is restricted by $z_f\ge 18$. As a general result, if ${\Omega }_m\ge 0.37$, these galaxies are not formed in FRW cosmologies with no dark energy since for all these cases $z_f\to \infty$.

17 pages, 3 figures, Accepted for publication in Astrophysical Journal Letters

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