The results of a search for radio emission associated with molecular outflows in regions with a compact object are reported. The data were collected with the VLA in 1981 and 1983 and covered 12 fields and 15 outflows. The frequencies used were 1.4 GHz, 5 GHz and 15 GHz aimed at S187, NGC 1333, L1551, NGC 2024, M78, NGC 2071, S255, CFK 961, S68, AS 353A, S106, and NGC 7129. The positions, flux densities, spectra and sizes of the compact radio sources scanned are provided for each region and discussed. Radio continuum emissions were recorded whenever the bolometric luminosity exceeded 100 solar luminosities, and from three sources with luminosities below that magnitude. The sources S106, CRL 961 and LkH-alpha 234 all had spectra and angular breadths typical of stars undergoing spherical mass outflow. Smooth surface brightness distributions for S254, S255 and S257 support an interpretation as uniform density spherical Stromgren spheres. High resolution radio maps of NGC 2071 and S255 reveal that both have three compact objects distributed as the objects in Trapezium. The NGC 2071 objects are confined to a space the size of the solar system, with electron densities greater than 10,000/cu cm.
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Snell et al. (1986) studied this question.