Astronomy and Astrophysics – Astrophysics
Scientific paper
Feb 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987a%26a...173..352m&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 173, no. 2, Feb. 1987, p. 352-360.
Astronomy and Astrophysics
Astrophysics
53
Ammonia, Astronomical Spectroscopy, Interstellar Masers, Interstellar Matter, Star Formation, Thermal Emission, Atomic Excitations, H Ii Regions, Line Spectra, Molecular Excitation, Molecular Spectra, Radio Spectra
Scientific paper
Observations of 14NH3 and 15NH3 thermal transitions toward W51 IRS 2, which show various excitation conditions, are presented. In addition to the (J,K) = (6,3) and (9,6) transitions (Madden et al., 1986), the (J,K) = (5,4), (7,5), (9,8) and (10,8) transitions show spike-like emission features and are probably masering. If so, this is the first detection of para NH3 masers in outer space. The gas traced out by highly excited transitions of NH3 arises in a compact (2.4×10-2pc), hot (Tkin ≡ 300K) and dense (n(H2)vir = 107.7cm-3) region, which is probably optically thick in the IR range up to ≡200 μm and is heated by IRS 2. The masers may arise near the compact H II region W51d. The authors report the first detection of the (J,K) = (11,9) transition of NH3, which is 1446K above the ground state.
Henkel Carsten
Mauersberger Rainer
Wilson Thomas L.
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