Molecular Outflows Identified in the FCRAO CO Survey of the Taurus
  Molecular Cloud
  The 100 square degree FCRAO CO survey of the Taurus molecular cloud provides
an excellent opportunity to undertake an unbiased survey of a large, nearby,
molecular cloud complex for molecular outflow activity. Our study provides
information on the extent, energetics and frequency of outflows in this region,
which are then used to assess the impact of outflows on the parent molecular
cloud. The search identified 20 outflows in the Taurus region, 8 of which were
previously unknown. Both $^{12}$CO and $^{13}$CO data cubes from the Taurus
molecular map were used, and dynamical properties of the outflows are derived.
Even for previously known outflows, our large-scale maps indicate that many of
the outflows are much larger than previously suspected, with eight of the flows
(40%) being more than a parsec long. The mass, momentum and kinetic energy from
the 20 outflows are compared to the repository of turbulent energy in Taurus.
Comparing the energy deposition rate from outflows to the dissipation rate of
turbulence, we conclude that outflows by themselves cannot sustain the observed
turbulence seen in the entire cloud. However, when the impact of outflows is
studied in selected regions of Taurus, it is seen that locally, outflows can
provide a significant source of turbulence and feedback. Five of the eight
newly discovered outflows have no known associated stellar source, indicating
that they may be embedded Class 0 sources. In Taurus, 30% of Class I sources
and 12% of Flat spectrum sources from the Spitzer YSO catalogue have outflows,
while 75% of known Class 0 objects have outflows. Overall, the paucity of
outflows in Taurus compared to the embedded population of Class I and Flat
Spectrum YSOs indicate that molecular outflows are a short-lived stage marking
the youngest phase of protostellar life.
