Volume 368, Number 3, March IV 2001
|Page(s)||L21 - L24|
|Published online||15 March 2001|
A new deuterium abundance measurement from a damped Lyα system at *
European Southern Observatory, Karl-Schwarzschildstr. 2, 85748 Garching bei München, Germany
2 Observatoire de Genève, 1290 Sauverny, Switzerland
3 Osservatorio Astronomico di Trieste, Via G. B. Tiepolo 11, 34131 Trieste, Italy
Corresponding author: S. D'Odorico, email@example.com
Accepted: 1 February 2001
We present the first D/H measurement in a damped Lyα (hereafter DLA) system at towards QSO 0347-3819 obtained from the UVES-VLT spectra. The DLA absorber has a metallicity of [Zn/H] and a relatively simple velocity structure, with two dominating components detected in several metal lines. The hydrogen Lyman series can be followed down to Ly12 thanks to the high UV-Blue efficiency of UVES. The best fit of the Lyman series lines, and in particular of Lyϵ, Ly8, Ly10 and Ly12, relatively free of local contamination, is obtained when the DI absorption is included in the two main components. The measured deuterium column density yields close to other low D/H values from Lyman limit systems. The corresponding values for the baryon to photon ratio and the baryon density derived from D/H are and respectively.
Key words: cosmology: observations / quasars: QSO 0347 / 3819 / nuclear reactions, nucleosynthesis, abundances
© ESO, 2001
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