Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 1976
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976a%26a....51..155s&link_type=abstract
Astronomy and Astrophysics, vol. 51, no. 1, Aug. 1976, p. 155-157. Research supported by the Statens Naturvetenskapliga Forskni
Astronomy and Astrophysics
Astronomy
4
Electron Transitions, Hydrocarbons, Interstellar Masers, Interstellar Matter, Molecular Excitation, Free Radicals, Hyperfine Structure, Line Spectra, Microwave Emission, Molecular Ions, Radio Astronomy
Scientific paper
The note reports results of an unsuccessful search for the four hyperfine transitions in the cited rotational state of interstellar CH, which was performed using a 25.6-m radio telescope equipped with a traveling-wave maser radiometer. The frequency interval covered ranged from 4677 to 4850 MHz; the sources observed were W3 Cont, W51, Orion A, and IRC+10216. It is shown that the lines in the present excited state cannot be expected to be observed if the state is populated according to thermodynamic equilibrium at the kinetic temperature of the medium. The possibility is considered of detecting thermally excited CH in a more compact region and of detecting excited-state CH maser lines. It is concluded that no strong CH maser lines exist for the frequencies and sources covered.
Irvine William M.
Kollberg Erik
Rydbeck E. H. O.
Sume A.
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