First detection of the ground-state J(K) = 1(0)-0(0) submillimeter transition of interstellar ammonia

Details First detection of the ground-state J(K) = 1(0)-0(0) submillimeter transition of interstellar ammonia First detection of the ground-state J(K) = 1(0)-0(0) submillimeter transition of interstellar ammonia

Aug 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983apj...271l..27k&link_type=abstract

Astrophysical Journal, Part 2 - Letters to the Editor (ISSN 0004-637X), vol. 271, Aug. 1, 1983, p. L27-L30.

Astronomy and Astrophysics

Astrophysics

28

Ammonia, Astronomical Spectroscopy, Ground State, Interstellar Gas, Molecular Clouds, Orion Nebula, C-141 Aircraft, Infrared Spectra, Inversions, Molecular Rotation, Spectral Line Width

Scientific paper

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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