CAN OLD GALAXIES AT HIGH REDSHIFTS AND BARYON ACOUSTIC OSCILLATIONS CONSTRAIN H-0?

Autor(es)

Lima, J. A. S. ^[1] ; Jesus, J. F. ^[1] ; Cunha, J. V. ^[1]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, USP, Dept Astron, BR-05508900 Sao Paulo - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Astrophysical Journal Letters; v. 690, n. 1, p. L85-L88, JAN 1 2009.
• Citações Web of Science: 25

Resumo

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)

• Processo FAPESP: 05/02809-5 - Investigando as componentes escuras do universo com raios-X, SNE IA, RCF, efeito Sunyaev-Zel'dovich e idades de objetos velhos
• Beneficiário: João Vital da Cunha Júnior
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado
• Processo FAPESP: 04/13668-0 - Cosmologia na era da precisão: energia escura, matéria escura e radiação cósmica de fundo
• Beneficiário: Jose Ademir Sales de Lima
• Modalidade de apoio: Auxílio à Pesquisa - Temático