| Literature DB >> 11538285 |
Y C Minh1, M K Brewer, W M Irvine, P Friberg, L E Johansson.
Abstract
We derive HOCO+ column densities approximately 10(15) cm-2 toward the Galactic center and < or = 10(12) cm-2 for cold dark clouds from observations and an LVG model. We mapped the HOCO+ 4(04)-3(03) line toward Sgr A. The fractional abundance of HOCO+ in the Galactic center region is three orders of magnitude larger than predicted by quiescent ion-molecule chemistry and an order of magnitude larger than predicted by a MHD shock model. If HOCO+ traces interstellar CO2, the implied high abundance ([CO2] approximately [CO]) in the Galactic center may result from UV photolysis of grain mantles.Entities:
Keywords: NASA Discipline Exobiology; NASA Discipline Number 52-10; NASA Program Exobiology; Non-NASA Center
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Year: 1991 PMID： 11538285
Source DB: PubMed Journal: Astron Astrophys ISSN： 0004-6361 Impact factor: 5.802