Astronomy and Astrophysics – Astrophysics
Scientific paper
Sep 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993a%26a...276l..29w&link_type=abstract
Astronomy and Astrophysics, Vol.276, NO. 1/SEPI, P. L29, 1993
Astronomy and Astrophysics
Astrophysics
7
Molecular Clouds, Molecular Lines, Orion Kl
Scientific paper
The first astronomical detections of the (J, K) = (10,10), (11,11), (12,12), (13,13) and (14,14) doublet inversion emission lines of NH3 at 1 cm wavelength are presented. These transitions are emitted from energy levels up to 1900K above the ground state; these are the most energetic states probed by quasithermal radio emission lines. The linewidths and radial velocities are consistent with emission from the Hot Core of the Orion KL nebula. There is no systematic change in ΔVl/2 and V1st with (J, K). The spectra also show no wide linewings; these findings agree with results for inversion transitions between lower lying doublet levels. From a least squares fit to the column densities of the new NH3 inversion line data, Trot ˜ 400±40K; this exceeds the previous value based on lower lying NH3 inversion lines. A good fit to the 37 NH3 inversion lines is obtained using a model with spherical symmetry and all NH3 inversion lines thermalized. This gives n(H2)˜R-25±02, if Tk ˜ R-0.4. Comparisons are made with other Hot Core results.
Dahmen G.
Henkel Carsten
Huttemeister Susanne
Lemme Claudia
Linhart A.
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