The JCMT Gould Belt Survey: Understanding the influence of molecular
  outflows on Gould Belt clouds
  Using JCMT Gould Belt Survey data from CO J=3-2 isotopologues, we present a
meta-analysis of the outflows and energetics of star-forming regions in several
Gould Belt clouds. The majority of the regions are strongly gravitationally
bound. There is evidence that molecular outflows transport large quantities of
momentum and energy. Outflow energies are at least 20 per cent of the total
turbulent kinetic energies in all of the regions studied and greater than the
turbulent energy in half of the regions. However, we find no evidence that
outflows increase levels of turbulence, and there is no correlation between the
outflow and turbulent energies. Even though outflows in some regions contribute
significantly to maintaining turbulence levels against dissipation, this relies
on outflows efficiently coupling to bulk motions. Other mechanisms (e.g.
supernovae) must be the main drivers of turbulence in most if not all of these
regions.
