Constraints on dark energy from Chandra observations of the largest relaxed galaxy clusters

Details Constraints on dark energy from Chandra observations of the largest relaxed galaxy clusters Constraints on dark energy from Chandra observations of the largest relaxed galaxy clusters

2004-05-18

arxiv.org/abs/astro-ph/0405340v1

Mon.Not.Roy.Astron.Soc.353:457,2004

Astronomy and Astrophysics

Astrophysics

12 pages, 11 figures, 2 tables. To appear in MNRAS

Scientific paper

10.1111/j.1365-2966.2004.08080.x

We present constraints on the mean dark energy density, Omega_X and dark energy equation of state parameter, w_X, 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 w_X<-0.7 at 95 per cent confidence. Similar results on the mean matter density and dark energy equation of state parameter, Omega_m=0.24\pm0.04 and w_X=-1.20^{+0.24}_{-0.28}, are obtained by replacing the CMB data with standard priors on the Hubble constant and mean baryon density and assuming a flat geometry.

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