BIPOLAR OUTFLOW IN B335 - THE SMALL-SCALE STRUCTURE

Interferometric observations of the (CO)-C-12 (J = 1-0) and 2.6 mm continuum emission toward the young stellar object in B335 are presented. Our angular resolution of 8" x 5" is a factor of 3 higher than those of the previous single-dish observations. The (CO)-C-12 high-velocity emission shows distinct biconical outflow structure having a size of a few thousand AU. The north-south extent of the outflow at its center is smaller than our present beam size, indicating that the outflow is focused within approximately 1000 AU of its origin. Within approximately 4" of the outflow center, there is a 2.6 mm continuum source with a peak flux of approximately 80 mJy. This indicates that the very dense material of n(H2) greater than or similar to 10(8) cm-3 is surrounding the young stellar object which should be the driving source of the outflow. Such dense material may be responsible for collimating the outflow into two oppositely directed jets. In the vicinity of the origin, the outflow shows a sudden increase in velocity away from its center. A simple dynamical model of the expanding " snowplowing " shell can explain the velocity field of the outflow in B335.