Abstract
Radio recombination lines (RRL) of carbon towards Cas A has now been observed over the range of frequencies 16.7 – 225 MHz. The obtained results allow to deduce ISM parameters in Perseus arm where the lines originate. Satisfactory agreement with the entire observation data is achieved by two models: the “hot” one with Te=50 K and Ne=0. 15 cm-3 and the “cold” one with Te=18 K and Ne=0.3 cm-3. The negative result in attempts to detect hydrogen RRLs with presence of carbon lines make it possible to define the upper limit of hydrogen ionization rate.
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Sorochenko, R.L., Smirnov, G.T. (1990). Low Frequency Radio Recombination Lines Towards Cas A. In: Gordon, M.A., Sorochenko, R.L. (eds) Radio Recombination Lines: 25 Years of Investigation. Astrophysics and Space Science Library, vol 163. Springer, Dordrecht. https://doi.org/10.1007/978-94-009-0625-9_18
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DOI: https://doi.org/10.1007/978-94-009-0625-9_18
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