SIMBAD references

Estimates of H₀ from the Sunyaev-Zel'dovich effect (SZE) and X-ray surface brightness of galaxy clusters depends on the underlying cosmology. In the current Λ cold dark matter (ΛCDM) flat cosmology, a possible technique to broke the degeneracy on the mass density parameter (Ω_m) is to apply a joint analysis involving the baryon acoustic oscillations (BAOs). By adopting this technique to the (H₀, Ω_m) parameter space, we obtain new constraints on the Hubble constant H₀ from BAO signatures as given by the Sloan Digital Sky Survey (SDSS) catalogue. Our analysis based on the SZE/X-ray data for a sample of 25 clusters yields H₀= 74⁺⁴_–3.5 km/s/Mpc (1σ, neglecting systematic uncertainties). This result is in good agreement with independent studies from the Hubble Space Telescope key project and the recent estimates of the Wilkinson Microwave Anisotropy Probe, thereby suggesting that the combination of these three independent phenomena provides an interesting method to constrain the Hubble constant.