Vibrationally excited ammonia toward Orion-KL

Details Vibrationally excited ammonia toward Orion-KL Vibrationally excited ammonia toward Orion-KL

Oct 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988a%26a...205..235m&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 205, no. 1-2, Oct. 1988, p. 235-242.

Astronomy and Astrophysics

Astrophysics

19

Ammonia, Early Stars, Interstellar Masers, Molecular Clouds, Molecular Excitation, Vibrational Spectra, Cosmic Dust, Electron Transitions, Ground State, Millimeter Waves, Signal To Noise Ratios

Scientific paper

Toward Orion KL, the tentative detection of the only millimeter-wave transition of vibrationally excited ammonia, the ν2(2, 1)s - ν2(1, 1)a line, is reported. Assuming that the emission originates from the hot core, the vibrational temperature is 160(±10)K, in agreement with determinations from ground state 1.3 cm inversion lines. The proposed excitation mechanism for the ν2 feature is via absorption of the 10 μm continuum from the dust inside the hot core. Upper line temperature limits are also given for W51d, Sgr B2(M), IRC +10216 and CIT 6. The spectrum from Orion contains additional 40 features between 139.64 and 140.372 GHz. The majority of these lines, 22, remains unidentified. The tentative detection of the first highly excited interstellar line of deuterated formaldehyde, the 93,7 - 102,8 transition of HDCO, is reported.

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