Key points are not available for this paper at this time.
We present constraints on the mean dark energy density, OmegaX and dark energy equation of state parameter, wX, based on Chandra measurements of the X-ray gas mass fraction in 26 X-ray luminous, dynamically relaxed galaxy clusters spanning the redshift range 0. 07-1, the same data require wX
Allen et al. (Wed,) studied this question.