Abstract
THE existence of recombination lines of highly excited states of hydrogen is well established through recent radio observations1,2 of various galactic H II regions. This communication reports the detection and analysis of a new line n167→n166 (1,424.736 Mc/s) in M17, which extends our previous results1 to lower frequencies. This particular n→n−1 transition lies closest to the well-known 21-cm hyperfine line of interstellar hydrogen. We also suggest a convenient notation for the various transitions.
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Lilley, A. E., Menzel, D. H., Penfield, H., and Zuckerman, B., Nature, 209, 468 (1966).
Hoglund, B., and Mezger, P. G., Science, 150, 339 (1965).
Westerhout, G., Bull. Astro. Netherlands, 14, 215 (1958).
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PALMER, P., ZUCKERMAN, B. Detection of Hydrogen Emission Line 166α in M17. Nature 209, 1118 (1966). https://doi.org/10.1038/2091118a0
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DOI: https://doi.org/10.1038/2091118a0
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