Influence of Dielectronic Recombination on the Radio Recombination Lines of Carbon
Abstract
The influence of dielectronic recombination on the population of the highly excited states of carbon is examined under typical nebular conditions. The resuits indicate that in certain circumstances, dielectronic recombination can produce a considerable enhancement of the recombination lines. Thus, for example, in an H II region with an electron temperature 12000 K and electron density 50 cm-8, the C 109 line could appear in emission with an intensity of several per cent of that of the neighbouring H 109 o' line. However, there is not as yet sufficient information to permit the positive identification of the anomalous microwave line in NGC 2024 and IC 1795 as a carbon recombination line originating from an H II region.
- Publication:
-
Astronomy and Astrophysics
- Pub Date:
- April 1969
- Bibcode:
- 1969A&A.....1..365G