2001/01/30 by J. S. Alcaniz, J. A. S. Lima · 1 citation
Physics and Astronomy · #Astronomy #Astrophysics #Black Holes and Theoretical Physics #Cold dark matter #Cosmology #Cosmology and Gravitation Theories #Dark energy #Dark fluid #Dark galaxy #Dark matter #Epoch (astronomy) #Galaxies: Formation, Evolution, Phenomena #Galaxy #Galaxy formation and evolution #Galaxy merger #Physics #Quintessence #Redshift #Universe #astro-ph
paper · pdf · doi:10.1086/319642
published as Astrophys.J. 550 (2001) L133 · 17 pages, 3 figures, Accepted for publication in Astrophysical Journal Letters
arxiv created 2001/01/30 · openalex publication_date 2001/04/01 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
The influence of a dark component on the first epoch of galaxy formation is analyzed 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 = ωρ 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 (Ω x = 0.7, ω < -0.6), we find a lower bound of z f ≥ 7.7, whereas in the extreme case of the Λ + cold dark matter model (ω = -1) the limit is slightly smaller ( z f ≥ 5.8). The case for open cold dark matter models has also been discussed. For Ω m ≃ 0.3, the formation redshift is restricted by z f ≥ 18. As a general result, if Ω m ≥ 0.37, these galaxies are not formed in FRW cosmologies with no dark energy since for all these cases z f → ∞ .