Observations of Interstellar HOCO +: Abundance Enhancements toward the Galactic Center
Abstract
A survey of the 404-303 and 101-000 transitions of HOCO+ has been made toward several molecular clouds. The HOCO+ molecule was not observed in any sources except Sgr B2 and Sgr A. The 505- 404 and 414- 313 transitions were also detected toward Sgr B2. The results indicate that gas phase CO2 is not a major carbon reservoir in typical molecular clouds. The column density of HOCO+ at the emission peak in Sgr B2 is ≡3×1014cm-2, and the fractional abundance relative to H2 ≥ 3×10-10.
- Publication:
-
The Astrophysical Journal
- Pub Date:
- November 1988
- DOI:
- 10.1086/166827
- Bibcode:
- 1988ApJ...334..175M
- Keywords:
-
- Galactic Nuclei;
- Hydrocarbons;
- Interstellar Matter;
- Molecular Clouds;
- Carbon Dioxide;
- Emission Spectra;
- Interstellar Chemistry;
- Astrophysics;
- GALAXIES: NUCLEI;
- INTERSTELLAR: ABUNDANCES;
- INTERSTELLAR: MOLECULES