A multilevel study of ammonia in star-forming regions. III - Orion-KL

Details A multilevel study of ammonia in star-forming regions. III - Orion-KL A multilevel study of ammonia in star-forming regions. III - Orion-KL

Aug 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988a%26a...201..285h&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 201, no. 2, Aug. 1988, p. 285-298.

Astronomy and Astrophysics

Astronomy

45

Ammonia, Molecular Clouds, Molecular Spectra, Orion Nebula, Star Formation, Brightness Temperature, Infrared Astronomy, Interstellar Gas, Line Spectra, Thermodynamic Equilibrium

Scientific paper

New observations of 28 ammonia inversion transitions of (N-14)H3 toward the core of the Orion molecular cloud have been obtained using a K-band maser receiver together with a 1024 channel autocorrelation spectrometer. A broad velocity component is identified whose position is coincident with the hot core, and this plateau component is found to have a rotation temperature of about 125 K. The results show rotation temperatures of 55 K for the spike component and 160 K for the hot core. The results suggest that in all cases, approximate thermalization (LTE) of the level populations may have occurred for both metastable (J + K) and nonmetastable transitions.

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