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We use baryon acoustic peak measurements by Eisenstein et al. (2005) andPercival et al. (2007a) and galaxy cluster gas mass fraction measurements ofAllen et al. (2008) to constrain parameters of three different dark energymodels. For time-independent dark energy, the Percival et al. (2007a)constraints, which make use of the WMAP measurement of the apparent acoustichorizon angle, most effectively constrain a cosmological parameter close tospatial curvature and favor a close to spatially flat model. In aspatially-flat model the Percival et al. (2007a) data less effectivelyconstrain time-varying dark energy. The joint baryon acoustic peak and galaxycluster gas mass constraints are consistent with but tighter than those derivedfrom other data. A time-independent cosmological constant in a spatially-flatmodel provides a good fit to the joint data, but slowly-evolving dark energycan not yet be ruled out.

Constraints on dark energy from baryon acoustic peak and galaxy cluster gas mass measurements