Properties of galaxy clusters: mass and correlation functions (original) (raw)

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Constancy of the cluster gas mass fraction in theRh=ctUniverse

Proceedings of the Royal Society A: Mathematical, Physical and Engineering Science

The ratio of baryonic to dark matter densities is assumed to have remained constant throughout the formation of structure. With this, simulations show that the fraction f gas ( z ) of baryonic mass to total mass in galaxy clusters should be nearly constant with redshift z . However, the measurement of these quantities depends on the angular distance to the source, which evolves with z according to the assumed background cosmology. An accurate determination of f gas ( z ) for a large sample of hot ( kT e >5 keV), dynamically relaxed clusters could therefore be used as a probe of the cosmological expansion up to z <2. The fraction f gas ( z ) would remain constant only when the correct cosmology is used to fit the data. In this paper, we compare the predicted gas mass fractions for both Λ cold dark matter ( Λ CDM) and the R h = ct Universe and test them against the three largest cluster samples (LaRoque et al. 2006 Astrophys. J. 652, 917–936 ( doi:10.1086/508139 ); Allen et al. ...

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$Constancy of the cluster gas mass fraction in theRh=ctUniverse Cover Page$

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$The cluster gas mass fraction as a cosmological probe: A revised study Cover Page$

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Properties of galaxy clusters: mass and correlation functions (original) (raw)

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