Deuterium-bearing Molecules in the Large Magellanic Cloud

Details Deuterium-bearing Molecules in the Large Magellanic Cloud Deuterium-bearing Molecules in the Large Magellanic Cloud

Nov 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996dln.........44m&link_type=abstract

Daresbury Laboratory: Newsletter on Analysis of Astronomical Spectra, p. 44

Mathematics

Logic

Deuterium, Magellanic Clouds, Photons, Baryons, Solar System, Cosmology, Universe, Sensitivity, Molecules, Distance

Scientific paper

Deuterium is made in the early Universe and is known to be a sensitive indicator of the baryon density in the sense that the D/H abundance ratio decreases as the density of baryons increases. Measurements of D/H have been made in the Solar System and, through Copernicus observations of nearby (distances less than 1 kpc) stars and indicate D/H approximately (1.5-2.0)10-5 (Linsky et al). Together with abundance determinations of other light elements, particularly He-3, the observations lead to constraints on the fundamental cosmological parameter, eta, the baryon-to-photon ratio, with eta = (3.5-7.9)10-10 (Hata et al.). This corresponds to a baryon density parameter (for Tcmb = 2.726 +/- 0.010) of OmegaB(h502 = 0.05-0.11 where h50 is the Hubble parameter measured in units of 50 km/s/Mpc amd OmegaB is the baryon density relative to the critical density.

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