Abstract
Observations of the C56α line—the first carbon radio recombination line in the millimeter waveband—in the directions of the Orion Bar, NGC 2024, and W3 are reported. The results are analyzed together with data for the IR fine-structure lines of CII and OI, enabling unambiguous determination of the temperature and density in the photodissociation regions separating the HII regions and parent molecular clouds.
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Translated from Astronomicheski\(\overset{\lower0.5em\hbox{$\smash{\scriptscriptstyle\smile}$}}{l} \) Zhurnal, Vol. 77, No. 7, 2000, pp. 488–498.
Original Russian Text Copyright © 2000 by Sorochenko, Tsivilev.
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Sorochenko, R.L., Tsivilev, A.P. Physical conditions in photodissociation regions from observations of carbon radio recombination lines and IR fine-structure lines of CII and OI. Astron. Rep. 44, 426–435 (2000). https://doi.org/10.1134/1.163867
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DOI: https://doi.org/10.1134/1.163867