White, Glenn J.; Phillips, J. P.; Richardson, K. J.; Frost, R. F.; Watt, G. D.; Beckman, J. E. and Davis, J. H.
(1983).
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| URL: | http://adsabs.harvard.edu/full/1983MNRAS.204.1117W |
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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
| Item Type: | Journal Article |
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| Copyright Holders: | 1983 Royal Astronomical Society |
| 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/Department: | Faculty of Science, Technology, Engineering and Mathematics (STEM) > Physical Sciences Faculty of Science, Technology, Engineering and Mathematics (STEM) |
| Interdisciplinary Research Centre: | Centre for Earth, Planetary, Space and Astronomical Research (CEPSAR) |
| Item ID: | 33781 |
| Depositing User: | G. J. White |
| Date Deposited: | 07 Jun 2012 14:35 |
| Last Modified: | 06 Aug 2016 10:25 |
| URI: | http://oro.open.ac.uk/id/eprint/33781 |
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