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Title:
A new assault on the 92 centimeter line of D I
Authors:
Blitz, Leo; Heiles, Carl
Affiliation:
AA(Maryland, University, College Park), AB(California, University, Berkeley)
Publication:
Astrophysical Journal, Part 2 - Letters to the Editor (ISSN 0004-637X), vol. 313, Feb. 15, 1987, p. L95-L98. (ApJL Homepage)
Publication Date:
02/1987
Category:
Astrophysics
Origin:
STI
NASA/STI Keywords:
Centimeter Waves, Deuterium, Interstellar Matter, Abundance, Line Spectra, Noise Spectra, Radio Spectra
DOI:
10.1086/184838
Bibliographic Code:
1987ApJ...313L..95B

Abstract

Results are reported from a search for the 92-cm line of D I in the ISM toward the Galactic anticenter, performed using the 25.9-m UC Berkeley telescope at Hat Creek during 1984-1986 and the 42.7-m NRAO telescope at Green Bank during 1984. The spectrum for single-channel-equivalent integration time 1.7 Msec is presented and shown to be consistent with detection of the line at 2-3 mK, corresponding to primordial and solar-vicinity D/H ratios of about 0.00005 and less than about 0.00002-0.00003, respectively. The possibility that the present detection is only apparent (considering the spectrum rms noise level of 1.6 mK) is examined, and the implications of a nondetection at this level for theoretical models are discussed.

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