Abstract
We have detected emission from the v = 1..-->..0 S(1) quadrupole transition of H/sub 2/ toward the cluster of intense infrared and H/sub 2/O maser sources in W51 NORTH. The apparent luminosity of this line in W51 NORTH is only about 4% of the luminosity of the same line toward the Kleinmann-Low infrared cluster in Orion; however, additional line-of-sight extinction and spatial extent of the source may account for the lower apparent power in W51. Genzel et al. have suggested that the infrared and H/sub 2/O properties of these clusters are quite similar. We discuss the implications of the H/sub 2/ emission for mass loss in the W51 region and briefly consider some recently proposed models of radiation-driven mass outflow from pre--main-sequence stars.
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