Cosmological Constraints from Gas Mass Fractions of Massive, Relaxed Galaxy Clusters

We present updated cosmological constraints from measurements of the gas mass fractions ($f_{gas}$) of massive, dynamically relaxed galaxy clusters. Our new data set has greater leverage on models of dark energy, thanks to the addition of the Perseus Cluster at low redshifts, two new clusters at redshifts $z>0.97$, and significantly longer observations of four clusters at $0.6

Keywords:

• Equation of state (cosmology)
• Cosmological constant
• Galaxy cluster
• Redshift
• Dark energy
• Cosmic microwave background
• Physics
• Mass fraction
• Hubble's law
• Astrophysics

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