Further observations at the interstellar deuterium frequency

Details Further observations at the interstellar deuterium frequency Further observations at the interstellar deuterium frequency

Oct 1974

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1974apj...193...65p&link_type=abstract

Astrophysical Journal, vol. 193, Oct. 1, 1974, pt. 1, p. 65-67. NSF-supported research.

Astronomy and Astrophysics

Astrophysics

17

Absorption Spectra, Deuterium, Galactic Nuclei, Interstellar Gas, Neutral Particles, Astronomical Spectroscopy, Cosmology, Interstellar Extinction, Line Spectra

Scientific paper

Two sets of Sgr A observations of neutral deuterium in the direction of the galactic center are reported. A wider bandwidth was used in the second set with no significant reduction of overall noise levels. The line-peak temperature of the merged data from both years yields an upper limit for the D/H ratio of 0.00035; if the absorption is the deuterium line, this ratio will be between the above value and 0.00002. These values continue to imply cosmic densities insufficient to close the universe.

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