We explore the properties of dark energy from recent observational data, including the Gold Sne Ia, the baryonic acoustic oscillation peak from SDSS, the CMB shift parameter from WMAP3, the X-ray gas mass fraction in cluster and the Hubble parameter versus redshift. The Λ CDM model with curvature and two parameterized dark energy models are studied. For the Λ CDM model, we find that the flat universe is consistent with observations at the 1σ confidence level and a closed universe is slightly favored by these data. For two parameterized dark energy models, with the prior given on the present matter density, Ωₘ₀, with Ωₘ₀=0.24, Ωₘ₀=0.28 and Ωₘ₀=0.32, our result seems to suggest that the trend of Ωₘ₀ dependence for an evolving dark energy from a combination of the observational data sets is model-dependent.
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Wu et al. (2007) studied this question.