The Effects of Protostellar Jet Feedback on Turbulent Collapse

Abstract

We present results of hydrodynamic simulations of massive star forming regions with and without protostellar jets. We show that jets change the normalization of the stellar mass accretion rate, but do not strongly affect the dynamics of star formation. In particular, $M_{\ast }(t)\propto f^2(t-t_{\ast }{)}^2$ where $f=1-f_{\mathrm{jet}}$ is the fraction of mass accreted onto the protostar, $f_{\mathrm{jet}}$ is the fraction ejected by the jet, and $(t-t_{\ast }{)}^2$ is the time elapsed since the formation of the first star. The star formation efficiency is nonlinear in time. We find that jets have only a small effect (of order 25\%) on the accretion rate onto the protostellar disk (the "raw" accretion rate). We show that the small scale structure -- the radial density, velocity, and mass accretion profiles are very similar in the jet and no-jet cases. Finally, we show that the inclusion of jets does drive turbulence but only on small (parsec) scales.

15 pages, 14 figures

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• The impact of episodic outflow feedback on stellar multiplicity and the star formation efficiency
• Physical Properties and Scaling Relations of Molecular Clouds: the Impact of Star Formation
• Multiwavelength study of the G345.5+1.5 region
• Numerical Methods for Simulating Star Formation
• Influence of protostellar jets and HII regions on the formation and evolution of stellar clusters