Abstract
Recent observational results for the giant H II complex W 51 are reviewed. The radio continuum emission is produced by two types of component; a diffuse, very extended ionized gas with low emission measure; and a number of compact sources with high emission measures and electron densities. The compact components are associated with near-infrared sources and with massive molecular clouds, the densities of which range from \(n_{H_2 }\) ∼ 103 cm-3 to 105 cm-3. Some of the molecular clouds in the W51 complex may be part of a gas stream flowing along the Sagittarius spiral arm.
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Bieging, J. (1975). The W 51 source complex. In: Wilson, T.L., Downes, D. (eds) H II Regions and Related Topics. Lecture Notes in Physics, vol 42. Springer, Berlin, Heidelberg. https://doi.org/10.1007/3-540-07409-0_134
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