Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992mnras.259..457g&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 259, no. 3, p. 457-464.
Astronomy and Astrophysics
Astronomy
5
Interstellar Chemistry, Molecular Clouds, Radicals, Interstellar Matter, Molecular Spectra, Orion Nebula
Scientific paper
A 7-arcmin strip along the OMC1 ridge has been mapped in the transitions (C-13)O J = 2-1, (C-13)S J = 5-4 and CN N = 2-1. The cyanogen radical is found not to have an exceptionally high abundance in the so-called 'Radical Region'. Strong CN N = 1-0 emission detected previously instead results from a low excitation temperature. The N = 2-1 transition is subthermalized, in spite of optical depths as high as 3, and this is explained in terms of non-LTE effects. The chemistry of the Radical Region is examined using results from a recent spectral survey. The abundances of HCN, CS, C3H2 and CH3CCH are found to be similar to those in the cloud core, while SO, HCO(+) and HCS(+) are enhanced in the Radical Region by factors of about 5-50. It is concluded that this part of the cloud does not have very unusual chemistry. Previous results suggesting anomalous abundances are misleading, because the low-J transitions observed were enhanced in cool, dense gas.
Greaves Jane S.
White Glenn J.
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