A multilevel study of ammonia in star forming regions. II - G34.3 + 0.2, a new 'hot core'

Details A multilevel study of ammonia in star forming regions. II - G34.3 + 0.2, a new 'hot core' A multilevel study of ammonia in star forming regions. II - G34.3 + 0.2, a new 'hot core'

Aug 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987a%26a...182..137h&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 182, no. 1, Aug. 1987, p. 137-142.

Astronomy and Astrophysics

Astrophysics

42

Ammonia, Ground State, Infrared Radiation, Molecular Clouds, Space Density, Stellar Evolution, Atmospheric Effects, Flux Density, Hydrofluoric Acid, Spectrometers

Scientific paper

The detection of fifteen NH3 inversion transitions, ranging from 20 to 940K above the ground state, is reported from the molecular cloud G 34.3+0.2. It is shown that G 34.3+0.2 has one of the largest NH3 column densities so far determined. The authors find a kinetic temperature, Tkin, of 225±75K, an NH3 column density, N(NH3), of 1018.5±0.2, and an H2 column density, N(H2), of 1023.6±0.1cm-2. The space densities are n(NH3) = 101.6±0.2 and n(H2) = 107.2±0.2cm-3; the fractional abundance of NH3 is [NH3]/[H2] = 10-5.6±0.3 and the size 0.04±0.01 pc. All of these values are similar or even larger than those determined from Orion KL. The source, presumably heated by the associated ultracompact H II region, may be optically thick in the IR range up to ≡100 μm.

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