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- W1639778063 abstract "A telescope, equipped with a travelling wave maser preamplifier, was used to study emission in the three hyperfine transitions of the doublet state of interstellar CH. The main line was detected towards more than one hundred positions in optically dark nebulae. All three lines were observed in many directions with relatively strong main line emission. One of the main purposes of the observation was to study the excitation of interstellar CH in dark dust clouds. A statistical analysis of the data indicates that the antenna temperature increases linearly with the cloud opacity class, or the cloud density. An increase is also found for the CH column density, but it seems that the ratio between the CH and the total hydrogen column densities decreases for more opaque clouds. Available optical data agree well with the radio results. For Volume 1, see N--75-25785. (Author) (GRA)" @default.
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- W1639778063 date "1975-01-01" @default.
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- W1639778063 title "Radio observations of interstellar CH. Part II." @default.
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