Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005apj...630l..41r&link_type=abstract
The Astrophysical Journal, Volume 630, Issue 1, pp. L41-L44.
Astronomy and Astrophysics
Astronomy
14
Cosmology: Observations, Galaxy: General, Ism: Abundances, Radio Lines: Ism, Techniques: Spectroscopic
Scientific paper
The deuterium abundance in the primordial gas formed during the big bang is dependent on the baryon-to-photon ratio during nucleosynthesis. We report a measurement of the deuterium-to-hydrogen (D/H) ratio from a 6 σ detection of the hyperfine ground-state transition of deuterium at 327 MHz (92 cm) in emission from the interstellar gas in the region of the Galactic anticenter. We find the maximum signal at l=183°, where the deuterium line opacity is expected to be a maximum as a result of velocity crowding. Using these deuterium and existing hydrogen observations, we model the effects of beam dilution, spin temperature, and absorption of continuum to derive a D/H ratio of 2.3+1.5-1.3×10-5 by number. The errors are +/-3 σ plus our estimate of the systematic uncertainty in the conversion of the observed line amplitude to the D/H ratio.
Bania Thomas M.
Carter Jessica C.
Dudevoir K. A.
Fanous Brian J.
Kratzenberg Eric
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