Studying the Outflow-Core Interaction with ALMA Cycle 1 Observations of the HH46/47 Molecular Outflow

摘要

We present preliminary analysis of ALMA cycle 1 12m array ~(12)CO/~(13)CO /C~(18)O data of the HH 46/47 molecular outflow. ~(13)CO and C~(18)O trace relatively denser outflow material than ~(12)CO and allow us to trace the outflow to lower velocities than what it possible using only the ~(12)CO emission. Interestingly, the cavity wall of the red lobe can be seen at velocity as low as 0.2 km/s. Using C~(18)0, we are now able to estimate the optical depth of ~(13)CO, and then use the corrected ~(13)CO emission to further and better correct the ~(12)CO emission and estimate the mass, momentum, and kinetic energy of the outflow. Moreover, C~(18)O reveals a flattened rotational structure at the center, likely to be a rotational envelope infalling onto an inner Keplerian disk.