CS J = 5 -> 4 observations of galactic molecular clouds

Autor:	Glenn J. White, John H. Davis, G. D. Watt, R. F. Frost, J. P. Phillips, J. E. Beckman, K. J. Richardson
Rok vydání:	1983
Předmět:	Physics Space and Planetary Science Star formation Molecular cloud Brightness temperature Milky Way Rotational transition Astronomy and Astrophysics Astrophysics Stellar evolution Astronomical spectroscopy Line (formation)
Zdroj:	Monthly Notices of the Royal Astronomical Society. 204:1117-1123
ISSN:	1365-2966 0035-8711
DOI:	10.1093/mnras/204.4.1117
Popis:	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
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::2024393b5d46539fb9919a7dfd7789af https://doi.org/10.1093/mnras/204.4.1117 Zobrazit plný text záznamu