Constraining H₀ from Sunyaev-Zel'dovich effect, Galaxy Clusters X-ray data, and Baryon Oscillations

2006/11/30 by J. V. Cunha, L. Marassi, J. A. S. Lima · 1 citation
Physics and Astronomy · #astro-ph

paper · pdf · doi:10.1111/j.1745-3933.2007.00322.x

published as Mon.Not.Roy.Astron.Soc.Lett.379:L1-L5,2007 · 15 pages, 4 figures, 1 table

arxiv created 2006/11/30 · arxiv updated 2009/12/01

Abstract

Estimates of H₀ 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 (H₀, Ω_m) parameter space, we obtain new constraints on the Hubble constant H₀ from BAO signature as given by the Sloan Digital Sky Survey (SDSS) catalog. Our analysis based on the SZE/X-ray data for a sample of 25 clusters yields H₀= 74⁺⁴_-3.5 km s^-1 Mpc^-1 (1σ, neglecting systematic uncertainties). This result is in good agreement with independent studies from the \itHubble 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.

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