New limits on and from old galaxies at high redshift
arXiv:astro-ph/9902298 · doi:10.1086/312191
Abstract
The ages of two old galaxies (53W091, 53W069) at high redshifts are used to constrain the value of the cosmological constant in a flat universe (CDM) and the density parameter in Friedmann-Robertson-Walker (FRW) models with no -term. In the case of CDM models, the quoted galaxies yield two lower limits for the vacuum energy density parameter, and , respectively. Although compatible with the limits from statistics of gravitational lensing (SGL) and cosmic microwave background (CMB), these lower bounds are more stringent than the ones recently determined using SNe Ia as standard candles. For matter dominated universes (), the existence of these galaxies imply that the universe is open with the matter density parameter constrained by and , respectively. In particular, these results disagree completely with the analysis of field galaxies which gives a lower limit .
submitted to Astrophysical Journal Letters, 16 ApJ preprint pages including 4 figures
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