Tracing the Bipolar Outflow from Orion Source I

R. L. Plambeck, M. C. H. Wright, D. N. Friedel, S. L. Widicus Weaver, A. D. Bolatto, M. W. Pound, D. P. Woody, J. W. Lamb, S. L. Scott

Published 2009-09-16Version 1

Using CARMA, we imaged the 87 GHz SiO v=0 J=2-1 line toward Orion-KL with 0.45 arcsec angular resolution. The maps indicate that radio source I drives a bipolar outflow into the surrounding molecular cloud along a NE--SW axis, in agreement with the model of Greenhill et al. (2004). The extended high velocity outflow from Orion-KL appears to be a continuation of this compact outflow. High velocity gas extends farthest along a NW--SE axis, suggesting that the outflow direction changes on time scales of a few hundred years.