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Please use this identifier to cite or link to this item: http://hdl.handle.net/2289/1605

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)
Research Papers (A&A)

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