EPoS Contribution
EPoS Contribution
Understanding the influence of outflows on Gould Belt clouds

Emily Drabek-Maunder
Imperial, London, GB
Using James Clerk Maxwell Telescope (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.
Caption: This is a comparison between the turbulent kinetic, gravitational binding and outflow energies in multiple Gould Belt star-forming regions. Top: Comparison between the cloud turbulent kinetic (Eturb) and gravitational binding energies (Egrav), where the dashed line is Eturb = Egrav and the dotted line shows 2Eturb = Egrav. Centre: Comparison between the cloud turbulent kinetic and outflow kinetic (Eout) energies, where the dashed line is Eturb = Eout. Bottom: Comparison between the outflow kinetic and cloud gravitational binding energies, where the dashed line is Eout = Egrav.
J. Hatchell, Exeter, GB
J.V. Buckle, Cambridge, GB
J. Di Francesco, Victoria, CA
J. Richer, Cambridge, GB
Key publication

Suggested Session: Stellar Feedback