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Title:
First detection of the ground-state J(K) = 1(0)-0(0) submillimeter transition of interstellar ammonia
Authors:
Keene, J.; Blake, G. A.; Phillips, T. G.
Affiliation:
AA(California Institute of Technology, Pasadena, CA), AB(California Institute of Technology, Pasadena, CA), AC(California Institute of Technology, Pasadena, CA)
Publication:
Astrophysical Journal, Part 2 - Letters to the Editor (ISSN 0004-637X), vol. 271, Aug. 1, 1983, p. L27-L30. (ApJL Homepage)
Publication Date:
08/1983
Category:
Astrophysics
Origin:
STI
NASA/STI Keywords:
Ammonia, Astronomical Spectroscopy, Ground State, Interstellar Gas, Molecular Clouds, Orion Nebula, C-141 Aircraft, Infrared Spectra, Inversions, Molecular Rotation, Spectral Line Width
DOI:
10.1086/184086
Bibliographic Code:
1983ApJ...271L..27K

Abstract

The JK = 10 approaching 00 transition of ammonia at 572.5 GHz was detected in OMC-1 from NASA's Kuiper Airborne Observatory. The central velocity of the line (VLSR approximately = 9 km/s) indicates that it originates in the molecular cloud material, not the hot core. The derived filling factor of approximately 0.09 in a 2' beam implies a source diameter of approximately 35' if it is a single clump. This clump area is much larger than that derived from observations of the1 inversion transition. The larger optical depth in the 10 approaching 00 transition (75-350) can account for the increased source area and linewidth as compared with those seen in the 10 inversion transition. Previously announced in STAR as N83-25630

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