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Deuterium at high redshift: Primordial or evolved?
Astronomy and Astrophysics
On the basis of arguments from galactic chemical evolution we suggest that the recent observations of D/H vs. metallicity in several high redshift absorbers are best understood if the primordial D value is in the range 2-3 10^-5. This range points to a rather high baryonic density (Ω_Bh^2=0.019-0.026) compatible to the one obtained by recent estimates based on the Cosmic Microwave Background (CMB) anisotropy measurements. Slightly higher values (D/H=4 10^-5) are found in Lyman limit systems.doi:10.1051/0004-6361:20010861 fatcat:6xuydc2iozht3izqlrrsjzhxje