Observations by Gwinn, Moran, & Reid of the proper motions of water masers in W49N show that they have elongated distribution expanding from a common center. Features with high space velocity only occur far from the center, while low-velocity features occur at all distances. We propose that these observations can be interpreted in terms of a shell of shocked molecular gas that is driven by the expanding cocoon of a high-velocity protostellar jet. We present three-dimensional numerical simulations in support of this interpretation and argue that this source provides a unique oppurtunity for a detailed study of jet-driven cocoons.
Digital Object Identifier (DOI)
Low, Mordecai-Mark Mac; Elitzur, Moshe; Stone, James M.; and Königl, Arieh, "A Protostellar Jet Model for the Water Masers in W49N" (1994). Physics and Astronomy Faculty Publications. 225.