CO emission structure in the Taurus molecular cloud complex

A survey is reported of the J = 1 - 0 2.6-mm transition of CO, covering 11.5 square degrees toward the Taurus dark cloud complex, including Heiles Cloud 2 and DL 2. The main finding is the presence of systematic velocity structure in the Barnard 18 region of DL 2. This structure is tentatively interpreted as an expanding shell of molecular gas of diameter about 3 pc centered on a cluster of young T Tauri stars. The estimated momentum of the shell is consistent with that expected from winds from the young stars seen in the shell.