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

Jun, 2008
13 pages
Published in:
  • Astrophys.J. 703 (2009) 1904-1910
e-Print:

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Abstract: (arXiv)
We use baryon acoustic peak measurements by \citet{eisensteinetal} and \citet{percivaletal07a} and galaxy cluster gas mass fraction measurements of \citet{allen08} to constrain parameters of three different dark energy models. For time-independent dark energy, the \citet{percivaletal07a} constraints, which make use of the WMAP measurement of the apparent acoustic horizon angle, most effectively constrain a cosmological parameter close to spatial curvature and favor a close to spatially flat model. In a spatially-flat model the \citet{percivaletal07a} data less effectively constrain time-varying dark energy. The joint baryon acoustic peak and galaxy cluster gas mass constraints are consistent with but tighter than those derived from other data. A time-independent cosmological constant in a spatially-flat model provides a good fit to the joint data, but slowly-evolving dark energy can not yet be ruled out.