2007/09/15 by J. A. S. Lima, J. F. Jesus, J. V. Cunha · 4 citations
Physics and Astronomy · #Astronomy and Astrophysical Research #Cosmology and Gravitation Theories #Galaxies: Formation, Evolution, Phenomena #astro-ph #gr-qc
paper · pdf · doi:10.1088/0004-637x/690/1/l85
published as Astrophys.J.Lett.690:L85-L88,2009 · 16 pages, 6 figures, 1 table
arxiv created 2007/09/15 · openalex publication_date 2008/12/10 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/01
A new age--redshift test is proposed in order to constrain H 0 on the basis of the existence of old high-redshift galaxies (OHRGs). In the flat Λ cold dark matter model, the value of H 0 is heavily dependent on the mass density parameter Ω M = 1 − Ω Λ . Such a degeneracy can be broken through a joint analysis involving the OHRG and baryon acoustic oscillation signature. By assuming a galaxy incubation time, t inc = 0.8 ± 0.4 Gyr, our joint analysis yields a value of H 0 = 71 ± 4 km s −1 Mpc −1 (1σ) with the best-fit density parameter Ω M = 0.27 ± 0.03. Such results are in good agreement with independent studies from the Hubble Space Telescope key project and recent estimates of the Wilkinson Microwave Anisotropy Probe , thereby suggesting that the combination of these two independent phenomena provides an interesting method to constrain the Hubble constant.