HCO+ in NGC 253.
Abstract
HCO(+) emission has been detected toward the nucleus of NGC 253. The line profile is similar to those of CO and HCN emission from this source. The ratio of integrated HCO(+) and HCN intensities is essentially unity, similar to the value seen in M82 and in typical Galactic giant molecular clouds. Null results have also been obtained for HCO(+) emission in several other galaxies and for HNC emission toward M82. The potential significance of HCO(+) observations as measurements of cosmic-ray densities within and among galaxies is discussed.
- Publication:
-
The Astrophysical Journal
- Pub Date:
- February 1981
- DOI:
- 10.1086/158644
- Bibcode:
- 1981ApJ...243..765R
- Keywords:
-
- Formaldehyde;
- Galactic Nuclei;
- Hydrocyanic Acid;
- Interstellar Chemistry;
- Interstellar Matter;
- Molecular Clouds;
- Abundance;
- Carbon Monoxide;
- Free Radicals;
- Molecular Ions;
- Astrophysics