Bipolar molecular outflow from M17

Kinematics of the molecular clouds in star forming complex M17 is studied using high-resolution CO-line mapping data at resolution ($20" \sim 0.2$ pc) with Nobeyama 45-m telescope. The northern cloud M17, which we call "lobe", shown to have an elongated shell structure around a top-covered cylindrical cavity. lobe expanding $\sim 5$ \kms minor axis direction, and $ 3/\cos \ i$ km s$^{-1}$ major where $i$ inclination axis. kinetic energy motion on order 3\times 10^{49}$ ergs. We show that backyard having common origin denser "horn" flowing out from NGC 6618 toward south, so horn compose bipolar outflow. Intensity distributions across double-peak profile typical for cylinder Position-velocity diagrams (PVD) exhibit open ring higher- and/or lower-velocity side(s) being lacking or faded. This particular PVD behavior can be attributed outflow conical flow velocity increasing axes.