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Paper: W49N from 3.6 cm to 3 mm: Ionized Winds on 600 AU Scales?
Volume: 267, Hot Star Workshop III: the Earliest Stages of Massive Star Birth
Page: 363
Authors: de Pree, C. G.; Wilner, D. J.; Goss, W. M.
Abstract: Recent 7 mm observations of the W49A North massive star-forming region have detected radio recombination line (RRL) emission from ultracompact HII regions on 50 milliarcsecond scales. These observations, combined with multifrequency, high-resolution continuum imaging of the region at 7 mm with the VLA and at 3 mm with BIMA, indicate that several of the sources have both broad RRLs and rising spectra with indices (alpha) ranging from 0.8 to 1.1 between 3.6 cm and 3 mm. We propose, based on line and continuum observations as well as source morphology, that in a number of sources we may be observing ionized winds that arise from circumstellar disks.
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