New bipolar outflows in dark molecular clouds

We have used the 15-m diameter James Clerk Maxwell Telescope to map the J=2−1 transition of 12CO in a sample of highly opaque molecular clouds, each having at least one associated IRAS source with infrared flux characteristic of an embedded core. Seven clouds from this sample have been mapped so far, five of which display outflow activity. Two of these outflows, in the Lynds dark clouds L100 and L483, were previously unknown and both exhibit bipolar structures. We present maps of these and of two others where the new observations are significantly better than existing data. From 13CO data obtained at selected positions we calculate the present-day mass and energy of the high-velocity gas in L1262 to be $\sim 0.1M_\odot$ and $\sim5\times10^{35}$ J, respectively. These values are about a factor of 2 lower than those found for outflows in some other (better-known) low-luminosity sources. The energy of the outflow is approximately one fifth of the gravitational binding energy of the cloud and the role played by outflows in cloud support is briefly discussed.