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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 pp. 1117–1123.

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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 Item
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/School: Faculty of Science, Technology, Engineering and Mathematics (STEM) > Physical Sciences
Faculty of Science, Technology, Engineering and Mathematics (STEM)
Item ID: 33781
Depositing User: G. J. White
Date Deposited: 07 Jun 2012 14:35
Last Modified: 10 Dec 2018 07:01
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