The primordial deuterium abundance : problems and prospects

Details The primordial deuterium abundance : problems and prospects The primordial deuterium abundance : problems and prospects

1997-12-10

arxiv.org/abs/astro-ph/9712136v1

Astronomy and Astrophysics

Astrophysics

11 pages, LaTeX, 5 Postscript figures, to appear in the Proceedings of the SUBARU HDS (High Dispersion Spectrograph) Workshop

Scientific paper

The current status of extragalactic deuterium abundance is discussed using two examples of `low' and `high' D/H measurements. We show that the discordance of these two types of D abundances may be a consequence of the spatial correlations in the stochastic velocity field. Within the framework of the generalized procedure (accounting for such effects) one finds good agreement between different observations and the theoretical predictions for standard big bang nucleosynthesis (SBBN). In particular, we show that the deuterium absorption seen at z = 2.504 toward Q1009+2956 and the H+D Ly-alpha profile observed at z = 0.701 toward Q1718+4807 are compatible with D/H $\sim 4.1 - 4.6\times10^{-5}$. This result supports SBBN and, thus, no inhomogeneity is needed. The problem of precise D/H measurements is discussed.

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