Models of molecular clouds. I - Multitransition study of CS

Details Models of molecular clouds. I - Multitransition study of CS Models of molecular clouds. I - Multitransition study of CS

Jan 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984apj...276..625s&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 276, Jan. 15, 1984, p. 625-645.

Astronomy and Astrophysics

Astronomy

196

Astronomical Models, Carbon Compounds, Interstellar Matter, Molecular Clouds, Sulfides, Abundance, Emission Spectra, Infrared Astronomy, Molecular Rotation, Radiative Transfer, Tables (Data), Transition

Scientific paper

A mapping of the dense cloud cores of M17, S140, and NGC 2024 in four rotational transitions of the CS molecule show similar emission distribution in all four transitions. The similarity of the spatial distributions and the close agreement between line shapes of the transitions from different rotational levels suggest that the emission from all four transitions is produced in the same region of the cloud. The data for the four transitions were fitted simultaneously to a model of the CS excitation in order to derive the density and the column density of CS along each line of sight through the cloud core. Little density variation is found across the cloud cores, but the CS column density was found to vary by an order of magnitude, being largest at the core center and decreasing toward the edge. The results are addressed in terms of the emergence of CS emission in the cloud from numerous dense clumps, with little emission generated by the interclump medium.

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