Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982apj...255l.123w&link_type=abstract
Astrophysical Journal, Part 2 - Letters to the Editor, vol. 255, Apr. 15, 1982, p. L123-L127.
Astronomy and Astrophysics
Astrophysics
7
Carbon, Electron States, Interstellar Matter, Radio Spectra, Rydberg Series, Absorption Spectra, Cassiopeia A, Neutral Atoms, Optical Thickness
Scientific paper
The likelihood and significance of VLF radio recombination lines of carbon in the interstellar medium are assessed by means of calculations for the very high electronic states populations associated with neutral carbon atoms at less than 100 K. It is demonstrated that the carbon n-alpha transitions coincident with absorption features toward Cas A, near 26 MHz, will be in absorption and have a strength and line width compatible with that observed for physical conditions indicated for the bulk of the observed gas toward Cas A. The calculations also suggest that the radio recombination lines may be widely observable under diffuse cloud conditions in the interstellar gas, possessing useful diagnostics. Radio recombination lines at 630-640-alpha involve electrons excited to principal quantum numbers much higher than previously encountered in addition to unprecedentedly low VLF emission frequencies.
Walmsley Charles Malcolm
Watson William D.
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