Detection of radio recombination lines of hydrogen ionized by cosmic-ray protons in the cool interstellar medium |
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| Authors: | R. L. Sorochenko G. T. Smirnov |
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| Affiliation: | (1) NARO, National Radio Astronomy Observatory Tucson, 949 North Cherry Avenue, Tucson, AZ 857521-0655, USA;(2) Russian Academy of Sciences, P.N. Lebedev Physical Institute, Laninsky Prospect 53, Moskva, 119991, Russia |
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| Abstract: | The emission of hydrogen radio recombination lines from a cloud of cool interstellar matter toward the radio source Cassiopeia A has been detected. The formation of the radio recombination lines is initiated by cosmic rays. The rate of ionization of the interstellar hydrogen by cosmic-ray protons measured from the radio recombination lines using the most direct method is ζH = (1 ± 0.25)×10−16 s−1. This value of ζH is compared with measurements obtained using other methods. |
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