| Full text | |
| Author(s): |
Total Authors: 3
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| Affiliation: | [1] Univ Sao Paulo, USP, Dept Astron, BR-05508900 Sao Paulo - Brazil
Total Affiliations: 1
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| Document type: | Journal article |
| Source: | Astrophysical Journal Letters; v. 690, n. 1, p. L85-L88, JAN 1 2009. |
| Web of Science Citations: | 25 |
| Abstract | |
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 Lambda cold dark matter model, the value of H-0 is heavily dependent on the mass density parameter Omega(M) = 1- Omega(Lambda). 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) (1 sigma) with the best-fit density parameter Omega(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. (AU) | |
| FAPESP's process: | 04/13668-0 - Cosmology in the era of precision: dark energy, dark matter and background cosmic radiation |
| Grantee: | Jose Ademir Sales de Lima |
| Support Opportunities: | Research Projects - Thematic Grants |