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- W1969455510 abstract "view Abstract Citations (112) References (296) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Radio observations of interstellar CH. I. Rydbeck, O. E. H. ; Kollberg, E. ; Hjalmarson, A. ; Sume, A. ; Ellder, J. ; Irvine, W. M. Abstract Results are presented for some eight months of almost continuous high-sensitivity observations of the three hyperfine transitions of the CH ground state in the directions to or in extended areas around more than 30 H I and H II regions, dark dust clouds, OH/IR stars, and other sources. The observations were made with a traveling-wave maser preamplifier on a 25.6-m telescope, giving a zenith-system noise temperature of about 34 K. Detailed discussions of the CH spectra are given in source descriptions and tables; radiative-transfer considerations and possible CH excitation mechanisms are included. Some major findings are that: (1) CH is widespread in the Galaxy; (2) the three CH transitions are observed in emission almost everywhere and exhibit weak maser characteristics; (3) satellite transitions are generally more inverted than the main line; (4) CH, OH, and H2CO seem to be well mixed in Orion-arm and Perseus-arm cloud configurations; (5) the average main-line excitation temperature is about -15 K; (6) the lower satellite transition seems to be a very sensitive far-IR indicator; (7) significant departures from equilibrium line-intensity ratios appear toward H I and H II regions; and (8) the relative abundance of CH with respect to other molecular species seems to diminish systematically from dilute H I clouds to the densest molecular clouds. Publication: The Astrophysical Journal Supplement Series Pub Date: July 1976 DOI: 10.1086/190385 Bibcode: 1976ApJS...31..333R Keywords: Hydrocarbons; Interstellar Matter; Microwave Spectra; Radio Sources (Astronomy); H Ii Regions; Hyperfine Structure; Interstellar Masers; Milky Way Galaxy; Astrophysics full text sources ADS |" @default.
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- W1969455510 date "1976-07-01" @default.
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- W1969455510 title "Radio observations of interstellar CH. I" @default.
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