Journal
ASTROPHYSICAL JOURNAL
Volume 764, Issue 2, Pages -Publisher
IOP Publishing Ltd
DOI: 10.1088/0004-637X/764/2/138
Keywords
cosmological parameters; cosmology: observations; dark energy
Categories
Funding
- DOE [DEFG03-99EP41093]
- NSF [AST-1109275]
- Direct For Mathematical & Physical Scien
- Division Of Astronomical Sciences [1109275] Funding Source: National Science Foundation
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We use 21 Hubble parameter versus redshift data points from Simon et al., Gaztanaga et al., Stern et al., and Moresco et al. to place constraints on model parameters of constant and time-evolving dark energy cosmologies. The inclusion of the eight new measurements results in H(z) constraints more restrictive than those derived by Chen & Ratra. These constraints are now almost as restrictive as those that follow from current Type Ia supernova (SNIa) apparent magnitude versus redshift data, which now more carefully account for systematic uncertainties. This is a remarkable result. We emphasize, however, that SNIa data have been studied for a longer time than the H(z) data, possibly resulting in a better estimate of potential systematic errors in the SNIa case. A joint analysis of the H(z), baryon acoustic oscillation peak length scale, and SNIa data favors a spatially flat cosmological model currently dominated by a time-independent cosmological constant but does not exclude slowly evolving dark energy.
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