Statistics – Computation
Scientific paper
Jul 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985a%26a...148..254s&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 148, no. 2, July 1985, p. 254-262.
Statistics
Computation
36
Ammonia, Computational Astrophysics, Hydrogen Clouds, Molecular Clouds, Molecular Spectra, Radiative Transfer, Brightness Temperature, Hyperfine Structure, Molecular Excitation, Optical Thickness, Radiant Flux Density, Radio Astronomy
Scientific paper
The results of radiative transfer calculations for NH3 are compared with the currently accepted standard interpretation of NH3 data, by which it is assumed that all hyperfine components within the inversion transitions, as well as the (1, 1) and (2, 2) transitions, have the same excitation temperature. It is further assumed that this excitation temperature is well described by a two-level model, and that rotational temperature is a function of the kinetic temperature only. While the optical depth and rotational temperature thus derived are accurate within 10-30 percent, the kinetic temperature and the H2 densities are ambiguous. In general, a second solution with much higher density and lower temperature yields the same absolute values for the observable line intensities in the (J, K) (1, 1) and (2, 2) inversion transitions.
Stutzki Juergen
Winnewisser Gisbert
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