Constraining H0 from the Sunyaev-Zel'dovich effect, galaxy cluster X-ray data and baryon oscillations

J. V. Cunha, L. Marassi, J. A. S. Lima
2007 Monthly Notices of the Royal Astronomical Society: Letters  
Estimates of H_0 from Sunyaev-Zel'dovich effect (SZE) and X-ray surface brightness of galaxy clusters depends on the underlying cosmology. In the current ΛCDM flat cosmology, a possible technique to broke the degenerescency on the mass density parameter (Ω_m) is to apply a joint analysis involving the baryon acoustic oscillations (BAO). By adopting this technique to the (H_0, Ω_m) parameter space, we obtain new constraints on the Hubble constant H_0 from BAO signature as given by the Sloan
more » ... al Sky Survey (SDSS) catalog. Our analysis based on the SZE/X-ray data for a sample of 25 clusters yields H_0= 74^+4_-3.5 km s^-1 Mpc^-1 (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 WMAP, thereby suggesting that the combination of these three independent phenomena provides an interesting method to constrain the Hubble constant.
doi:10.1111/j.1745-3933.2007.00322.x fatcat:eq2a2q2745ephomckpd6m2ly4u