ABUNDANCE AND CHEMISTRY OF INTERSTELLAR HOCO+

Authors

YC MINH
MK BREWER
William M. Irvine, University of Massachusetts - AmherstFollow
P FRIBERG
LEB JOHANSSON

Publication Date

1991

Journal or Book Title

ASTRONOMY AND ASTROPHYSICS

Abstract

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.

Comments

The published version is located at http://adsabs.harvard.edu/full/1991A%26A...244..470M

Pages

470-476

Volume

244

Issue

2

Recommended Citation

MINH, YC; BREWER, MK; Irvine, William M.; FRIBERG, P; and JOHANSSON, LEB, "ABUNDANCE AND CHEMISTRY OF INTERSTELLAR HOCO+" (1991). ASTRONOMY AND ASTROPHYSICS. 238.
Retrieved from https://scholarworks.umass.edu/astro_faculty_pubs/238