The Deuterium Abundance in Quasar Absorption Systems

Details The Deuterium Abundance in Quasar Absorption Systems The Deuterium Abundance in Quasar Absorption Systems

Dec 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998tx19.confe.416l&link_type=abstract

Abstracts of the 19th Texas Symposium on Relativistic Astrophysics and Cosmology, held in Paris, France, Dec. 14-18, 1998. Eds.:

Astronomy and Astrophysics

Astrophysics

Scientific paper

The status of recent measurements of the deuterium abundance from the Lyman limit systems is reviewed and a new analysis of the D absorption in spectra of QSOs 1718+4807, 1009+2956, and 1937-1009 is presented. The analysis is based on the mesoturbulent model accounting for possible coherence in the bulk motions (non-Gaussian radial velocity distributions). The new approach leads to a single primordial value of D/H ~= (3.5 - 5) times 10^{-5} (2 sigma C.L.) instead of `low' and `high' D/H ratios obtained within the usual microturbulent approximation which disregards correlations in the large scale velocity field. This result supports homogeneous models of BBN yielding a cosmological baryon-to-photon ratio eta ~= (3.6 - 5.2) times 10^{-10}, which corresponds to Omega_b h^2100 ~= 0.01 - 0.02.

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