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White, Glenn J.; Phillips, J. P.; Richardson, K. J.; Frost, R. F.; Watt, G. D.; Beckman, J. E. and Davis, J. H.
(1983).
URL: http://adsabs.harvard.edu/full/1983MNRAS.204.1117W
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 nH2~105cm-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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About
- Item ORO ID
- 33781
- Item Type
- Journal Item
- ISSN
- 1365-2966
- Keywords
- astronomical spectroscopy; Milky Way galaxy; molecular clouds; stellar evolution; abundance; astronomical models; brightness temperature; carbon compounds; gas density; millimeter waves; sulfides
- Academic Unit or School
-
Faculty of Science, Technology, Engineering and Mathematics (STEM) > Physical Sciences
Faculty of Science, Technology, Engineering and Mathematics (STEM) - Copyright Holders
- © 1983 Royal Astronomical Society
- Depositing User
- G. J. White