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Title: A search for localized sources of noncosmological deuterium near the Galactic Centre
Authors: Lubowich, D.A.
Anantharamaiah, K.R.
Pasachoff, J.M.
Keywords: deuterium
galactic nuclei
interstellar matter
Milky wave galaxy
abundance hydrogen clouds
line spectra
molecular clouds
radio sources (astronomy)
Issue Date: 15-Oct-1989
Publisher: The University of Chicago Press for the American Astronomical Society
Citation: Astrophysical Journal, 1989, Vol.345, p770-775
Abstract: The VLA at the 92 cm D I hyperfine transition was used to search for a possible localized concentration of atomic deuterium near the Galactic center over a velocity range of + or - 180 km/s. The search yielded an upper limit for the D column density N(D) = 7.78 x 10 to the 16th T(s)/sq cm where T(s) is the spin temperature of the D I hyperfine lines. For the smaller velocity range of + or - 30 km/s, a more sensitive upper limit of N(D) = 3.12 x 10 to the 16th T(s)/sq cm is obtained. If D is associated with the H I clouds to the Galactic center, an upper limit for the D/H ratio of 0.0043 is obtained for the clouds at V = 20 km/s and 50 km/s. If a significant fraction of the D exists in atomic form in molecular clouds, the upper limits are 1.2 x 10 to the -7th for the V = 20 km/s molecular cloud near the Galactic center and 8.3 x 10 to the -7th for the V = 50 km/s molecular cloud near the Galactic center. These results are consistent with the D observed in the Galactic center and the ISM being primarily cosmological in origin.
ISSN: 0004-637X
1538-4357 (online)
Alternative Location:
Copyright: (1989) by the American Astronomical Society. Scanned images provided by the NASA ADS Data System.
Appears in Collections:Research Papers (A&A)

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