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Abundance and chemistry of interstellar HOCO(+)Column densities of 10 to the 15th/sq cm toward the Galactic center and not more than 10 to the 12th/sq cm for cold dark clouds are derived from observations using an LVG model, and the chemical implications are discussed. The HOCO(+) 4(04)-3(03) line toward Sgr A is mapped. The fractional abundance of HOCO(+) in the Galactic center region was found to be three orders of magnitude larger than predicted by quiescent ion-molecule chemistry and an order of magnitude larger than predicted by an MHD shock model. It is suggested that the possibly high CO2 abundance, and consequently the observed HOCO(+) abundance in the Galactic center, may result from UV photolysis of grain mantles.
Document ID
19910055008
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Minh, Y. C.
(Five-College Astronomy Dept. Amherst, MA, United States)
Brewer, M. K.
(Five-College Astronomy Dept. Amherst, MA, United States)
Irvine, W. M.
(Five College Radio Astronomy Observatory; Massachusetts, University Amherst, United States)
Friberg, P.
(Five-College Astronomy Dept. Amherst, MA, United States)
Johansson, L. E. B.
(Onsala Space Observatory Sweden; European Southern Observatory, La Silla, Chile)
Date Acquired
August 15, 2013
Publication Date
April 1, 1991
Publication Information
Publication: Astronomy and Astrophysics
Volume: 244
Issue: 2 Ap
ISSN: 0004-6361
Subject Category
Astrophysics
Accession Number
91A39631
Funding Number(s)
CONTRACT_GRANT: NAGW-436
CONTRACT_GRANT: NSF AST-88-15406
CONTRACT_GRANT: NSF INT-85-12284
Distribution Limits
Public
Copyright
Other

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