2008/07/31 by R. F. L. Holanda, J. V. Cunha, J. A. S. Lima
Physics and Astronomy · #Astronomy and Astrophysical Research #Baryon #Baryon acoustic oscillations #Context (archaeology) #Cosmology and Gravitation Theories #Degeneracy (biology) #Differential geometry #Galaxies: Formation, Evolution, Phenomena #Galaxy #Hubble's law #Sky #Surface brightness #astro-ph #gr-qc
paper · pdf · doi:10.1007/s10714-011-1292-5
8 pages, 4 figures, 1 table, accepted version in the general relativity and gravitation
arxiv created 2011/11/02 · openalex publication_date 2011/11/07 · arxiv updated 2012/01/20 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
The Hubble constant, H0, sets the scale of the size and age of the Universe and its determination from independent methods is still worthwhile to be investigated. In this article, by using the Sunyaev-Zel`dovich effect and X-ray surface brightness data from 38 galaxy clusters observed by Bonamente \itet al. (2006), we obtain a new estimate of H0 in the context of a flat ΛCDM model. There is a degeneracy on the mass density parameter (Ωm) which is broken by applying a joint analysis involving the baryon acoustic oscillations (BAO) as given by Sloan Digital Sky Survey (SDSS). This happens because the BAO signature does not depend on H0. Our basic finding is that a joint analysis involving these tests yield H0= 0.765+0.035-0.033 km s-1 Mpc-1 and Ωm=0.27+0.03-0.02. Since the hypothesis of spherical geometry assumed by Bonamente \it et al. is questionable, we have also compared the above results to a recent work where a sample of triaxial galaxy clusters has been considered.