Improved constraints on dark energy from Chandra X-ray observations of the largest relaxed galaxy clusters

We present constraints on the mean matter density, Omega_m, dark energy density, Omega_de, and the dark energy equation of state parameter, w, using Chandra measurements of the X-ray gas mass fraction (fgas) in 42 hot (kT>5keV), X-ray luminous, dynamically relaxed galaxy clusters spanning the redshift range 0.05

Keywords:

• Omega
• Cosmic microwave background
• Physics
• Astrophysics
• Cosmology
• Galaxy cluster
• Cosmological constant
• Dark energy
• Redshift
• Hubble's law

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