Abstract
A SPECTRAL line corresponding to the “anomalous” recombination line at 5,011 MHz (109α) described by Palmer et al.1 has been detected at 1,425 MHz (166α) in the HII regions NGC 2024, W3 and possibly W43. The intensity of the anomalous line compared with that of hydrogen is much greater for the 166α line than for the 109α line. A similar enhancement but of smaller magnitude has recently been reported for the anomalous 134α line by Zuckerman and Palmer2.
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References
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PEDLAR, A. Anomalous Recombination Line 166α. Nature 226, 830–831 (1970). https://doi.org/10.1038/226830a0
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DOI: https://doi.org/10.1038/226830a0
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