Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982apj...255..149s&link_type=abstract
Astrophysical Journal, Part 1, vol. 255, Apr. 1, 1982, p. 149-159.
Astronomy and Astrophysics
Astrophysics
92
Carbon Compounds, Electron Transitions, Molecular Clouds, Nebulae, Radiation Spectra, Radiative Transfer, Stellar Evolution, Astronomical Maps, Emission Spectra, Interstellar Matter, Line Spectra, Self Absorption, Sulfides
Scientific paper
The emission of the J = 1-0 and J = 2-1 transitions of CS in the three dark clouds TMC-1, L134 N, and B335 was observed. The J = 2-1 profiles for B335 and L134 N indicate that self-absorption by foreground lower excitation material is probably occurring. There is no obvious evidence for self-absorption in the J = 1-0 profiles in these two clouds or in any of the CS lines in TMC-1. The density structure of the clouds is determined by using CS emission as a probe. A large-velocity-gradient radiative transfer model is used to compute the excitation of CS as a function of CS abundance and density and thereby to determine the column density and space density in the clouds. B335 is centrally condensed and TMC-1 and L134 N are fragmented into two or more condensations. The observed structure may be indicative of an early phase of star formation.
Frerking Margaret A.
Langer William D.
Snell Ronald L.
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