First detection of the ground state JK 1/sub 0/ going to 0/sub 0/ submillimeter transition of interstellar ammonia
Technical Report
·
OSTI ID:5739449
The JK 1/sub 0/ approaching 0/sub 0/ 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 the sub 1 inversion transition. The larger optical depth in the 1/sub 0/ approaching 0/sub 0/ transition (75-350) can account for the increased source area and linewidth as compared with those seen in the 1/sub 0/ inversion transition.
- Research Organization:
- National Aeronautics and Space Administration, Moffett Field, CA (USA). Ames Research Center
- OSTI ID:
- 5739449
- Report Number(s):
- N-8325630; NASA-TM-84359; A-9321
- Country of Publication:
- United States
- Language:
- English
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