Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990apjs...72..303n&link_type=abstract
Astrophysical Journal Supplement Series (ISSN 0067-0049), vol. 72, Feb. 1990, p. 303-322. Research supported by the National Rad
Astronomy and Astrophysics
Astronomy
14
Ammonia, Continuous Radiation, Formaldehyde, Molecular Clouds, Radio Sources (Astronomy), Abundance, Interstellar Chemistry, Interstellar Gas
Scientific paper
The formaldehyde-to-ammonia abundance ratio is determined for five molecular clouds. The presence of formaldehyde and ammonia clumps are found to produce the most significant uncertainty in the formaldehyde-to-ammonia abundance ratio. If ammonia clumps are stable then their sizes, on average, are about 0.04 pc, somewhat smaller than the sizes seen in other molecular clouds. It is found, when combined with other data from the literature, that the observed formaldehyde-to-ammonia abundance ratios agree best with gas phase chemical models which predict a low formaldehyde-to-ammonia abundance ratio.
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