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• W1997139439 abstract "Recent simulations, as well as weak lensing and X-ray data, indicate that gas is a good tracer of the total mass in clusters. The constancy of the gas fraction fg in clusters of galaxies can thus be used as a novel distance indicator fg∝h32Ωb/Ω0. Assuming spherical symmetry and hydrostatic equilibrium allows us to infer fg using only the β-model parameters and an emission weighted temperature. Even though none of the factors h, Ωb, Ω0 is individually known to high precision, the relative distances between clusters at high redshift can be used to infer the deceleration parameters q0. Using this new model, the local population of clusters has a scatter of only 15% in the Hubble relation. The 3 clusters at redshift z ∼ 0.5 suggest q0 ≈ 0.85±0.29 with 1 − σ statistical error. This result would argue against a cosmological constant. The method is robust to errors in the measurement of the core radius as long as the product of the central density and the core radius squared ϱ0rc2 are well determined. However, this result may still be subject to unknown systematics such as cooling flows, which will require more detailed temperature maps, weak lensing data and numerical simulations to model accurately. Future lensing and X-ray data will dramatically improve the statistics." @default.
• W1997139439 created "2016-06-24" @default.
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• W1997139439 date "1997-10-01" @default.
• W1997139439 modified "2023-09-28" @default.
• W1997139439 title "Measuring the universal deceleration using angular diameter distances to clusters of galaxies" @default.
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• W1997139439 doi "https://doi.org/10.1016/s1384-1076(97)00021-3" @default.
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