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Hydrogenation of interstellar molecules: a survey for methylenimine (CH2NH)Methylenimine (CH2NH) has been convincingly detected for the first time outside the Galactic center as part of a study of the hydrogenation of interstellar molecules. We have observed transitions from energy levels up to about 100 K above the ground state in the giant molecular clouds W51, Orion KL and G34.3 + 0.15. In addition, CH2NH was found at the " radical-ion peak" on the quiescent ridge of material in the Orion molecular cloud. The abundance ratio CH2NH/HCN at the radical-ion peak agrees with the predictions of recent gas-phase chemical models. This ratio is an order of magnitude higher in the warmer cloud cores, suggesting additional production pathways for CH2NH, probably on interstellar grains.
Document ID
20040089277
Acquisition Source
Headquarters
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Dickens, J. E.
(Five College Radio Astronomy Observatory, University of Massachusetts Amherst 01003, United States)
Irvine, W. M.
DeVries, C. H.
Ohishi, M.
Date Acquired
August 21, 2013
Publication Date
April 10, 1997
Publication Information
Publication: The Astrophysical journal
Volume: 479
Issue: 1 Pt 1
ISSN: 0004-637X
Subject Category
Exobiology
Funding Number(s)
CONTRACT_GRANT: NAGW-436
CONTRACT_GRANT: AST 94-20159
Distribution Limits
Public
Copyright
Other
Keywords
Non-NASA Center
NASA Discipline Exobiology

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