Abstract
We report in this Letter some results of a study of the massive bipolar outflow in the central region of the giant molecular cloud Monoceros R2. We find in our CO J=1-0 maps an eggplant-shaped, thin bipolar outflow shell that outlines the extended blue lobe of the bipolar outflow. The projected length and width of the shell are about 5.3 and 2.7 pc, respectively, and the averaged projected thickness of the shell is ∼0.3 pc. The outflow shell's symmetry axis is inclined by ∼70° with respect to the line of sight. We make a quantitative comparison of our results with the Shu et al. outflow model incorporating a radially directed wind and find that this simple model naturally explains the shape of the observed shell
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