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http://hdl.handle.net/2289/1391
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. |
URI: | http://hdl.handle.net/2289/1391 |
ISSN: | 0004-637X 1538-4357 (online) |
Alternative Location: | http://adsabs.harvard.edu/cgi-bin/bib_query?1989ApJ...345..770L |
Copyright: | (1989) by the American Astronomical Society. Scanned images provided by the NASA ADS Data System. |
Appears in Collections: | Research Papers (A&A) |
Files in This Item:
File | Description | Size | Format | |
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1989 APJ V345 p770.pdf | 6p. | 1.08 MB | Adobe PDF | View/Open |
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