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http://hdl.handle.net/2289/1604| Title: | Observations of ortho- and para-thioformaldehyde |
| Authors: | Gardner, F.F. Hoglund, B. Shukre, C.S. Stark, A.A. Wilson, T.L. |
| Keywords: | ABUNDANCE ASTRONOMICAL SPECTROSCOPY FORMALDEHYDE INTERSTELLAR MATTER LINE SPECTRA MOLECULAR CLOUDS GAS DENSITY MOLECULAR COLLISIONS ORION NEBULA VELOCITY DISTRIBUTION |
| Issue Date: | May-1985 |
| Publisher: | Springer-Verlag |
| Citation: | Astronomy and Astrophysics, 1985, Vol.146, p303-306 |
| Abstract: | In the present observational study of the 3(12) - 2(11) and 3(13) - 2(12) transitions of ortho-H2CS and the 3(03) - 2(02) transitions of para-H2CS, the most precise results, for a beamwidth of 1.8 arcmin, were the para- and ortho- line ratios of 0.51 + or - 0.04 for Orion and 0.44 + or - 0.05 for DR 21 (OH). The ortho/para ratios are close to the values of about 0.56 derived from a large velocity gradient analysis employing the densities, kinetic temperatures and collision rates appropriate to H2CO cloud molecules, assuming a true para/ortho abundance ratio of 1:3. Revised estimates of the rest frequencies of the various formaldehyde lines observed are given. |
| URI: | http://hdl.handle.net/2289/1605 |
| ISSN: | 0004-6361 |
| Alternative Location: | http://adsabs.harvard.edu/cgi-bin/bib_query?1985A&A...146..303G |
| Copyright: | (1985) by the European Southern Observatory. Scanned images provided by the NASA ADS. |
| Appears in Collections: | Research Papers (A&A) |
Files in This Item:
| File | Description | Size | Format | |
|---|---|---|---|---|
| 1985 A&A V146 p303.pdf | 4p. | 664.22 kB | Adobe PDF | View/Open |
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