CS J = 5→4 observations of galactic molecular clouds

White, Glenn J.; Phillips, J. P.; Richardson, K. J.; Frost, R. F.; Watt, G. D.; Beckman, J. E. and Davis, J. H. (1983). CS J = 5→4 observations of galactic molecular clouds. Monthly Notices of the Royal Astronomical Society, 204(4) pp. 1117–1123.

DOI: https://doi.org/10.1093/mnras/204.4.1117

Abstract

Observations are reported of a sample of six regions of star formation in the J = 5→4 rotational transition of CS at 244 GHz. In combination with published results at lower frequencies, we show the J = 5→4 line temperatures for OMC-1, M17SW, W3(OH) and Ori B to be consistent with constant density large velocity gradient (LVG) models, indicating typical abundances X/(dV/dr)~4 x10^-10km^-1spc, and densities n_H2~10⁵cm^-3. For two clouds, W51 and DR21(OH), however, the results may indicate the need for substantial levels of CS thermalization, suggesting in turn high source densities and beam dilution

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