Resumo

BUSTI, V. C.; GUIMARAES, R. N.  e  LIMA, J. A. S.. A cross-check for H ₀ from lyman-α forest and baryon. Acoustic oscillations. Rev. mex. astron. astrofis [online]. 2016, vol.52, n.1, pp.3-10. ISSN 0185-1101.

A new method is proposed to infer the Hubble constant Ho through the ob served mean transmitted flux from high-redshift quasars and the baryon acoustic oscillations (BAOs). A semi-analytical model for the cosmological-independent vol ume density distribution function was adopted; it allowed us to obtain constraints on the cosmological parameters once a moderate knowledge of the Inter Galactic Medium (IGM) parameters is assumed. Our analysis, based on two different sam ples of Lyman-α forest and the BAO measurement, restricts (h,Ω m) to the intervals 0.19 ≤ Ω m ≤ 0.23 and 0.53 ≤ h ≤ 0.82 (1σ). Although the constraints are weaker compared with other estimates, we point out that, with a bigger sample and a better knowledge of the IGM, this method could provide complementary results to measure the Hubble constant independently of the cosmic distance ladder.

Palavras-chave : cosmological parameters; distance scale; intergalactic medium.

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