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CAN OLD GALAXIES AT HIGH REDSHIFTS AND BARYON ACOUSTIC OSCILLATIONS CONSTRAIN H0?

A new age--redshift test is proposed in order to constrain H0 on the basis of the existence of old high-redshift galaxies (OHRGs). In the flat Λ cold dark matter model, the value of H0 is heavily dependent on the mass density parameter ΩM = 1 − ΩΛ. Such a degeneracy can be broken through a joint analysis involving the OHRG and baryon acoustic oscillation signature. By assuming a galaxy incubation time, tinc = 0.8 ± 0.4 Gyr, our joint analysis yields a value of H0 = 71 ± 4 km s−1 Mpc−1 (1σ) with the best-fit density parameter ΩM = 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.