Astronomy and Astrophysics – Astrophysics
Scientific paper
Mar 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985a%26a...144...13s&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 144, no. 1, March 1985, p. 13-26. Sponsorship: Deutsche Forschungsgemeinschaft
Astronomy and Astrophysics
Astrophysics
84
Ammonia, Hyperfine Structure, Molecular Clouds, Molecular Spectra, Radiative Transfer, Stellar Evolution, Anomalies, Far Infrared Radiation, Hydrogen Clouds, Molecular Excitation, Population Inversion, Radiation Trapping
Scientific paper
For NH3 the authors present a simple radiative transfer model with selective trapping in the far IR (J, K) = (2, 1)→(1, 1) transition, which together with hyperfine selective collisional excitation is able to reproduce the observed hyperfine intensity anomalies in the molecules (J, K) = (1, 1) inversion transition. The model leads to the interpretation, that the anomalous hyperfine intensities emitting clouds are composed of many small (10-2pc), high density (106 - 107cm-3) clumps of 0.3 - 1 M_sun;, which may be the precursors of low mass star formation.
Stutzki Juergen
Winnewisser Gisbert
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