http://arxiv.org/abs/1609.09112
We analyze the physical properties and energy balance of density enhancements in two SPH simulations of the formation, evolution, and collapse of giant molecular clouds. In the simulations, no feedback is included, and so all motions are due either to the initial, decaying turbulence, or to gravitational contraction. We define the clumps as connected regions above a series of density thresholds.The resulting full set of clumps follow the generalized energy-equipartition relation $\sigma_{v}/R^{1/2} \propto \Sigma^{1/2}$, where $\sigma_{v}$ is the velocity dispersion, $R$ is the “radius”, and $\Sigma$ is the column density. We interpret this as a natural consequence of gravitational contraction at all scales, rather than virial equilibrium. However, clumps sub-samples selected by means of different criteria exhibit different scalings with size. Clumps selected by column density ranges follow Larson-like relations and clumps defined at lower density thresholds tend to show a larger scatter around equipartition. We show that in more than half of the cases, this scatter is dominated by large-scale turbulent compressions that {\it assemble} the clouds, rather than by small-scale random motions that would disperse them. Finally, we find that clumps lying in filaments tend to appear sub-virial and that at high densities ($n \ge 10^5$ cm$^3$) cores exhibiting moderate apparent kinetic energy excesses often contain sink (“stellar”) particles, excess that disappears when the stellar mass is taken into account in the energy balance, although some other cases are truly in a state of dispersal.
V. Camacho, E. Vazquez-Semadeni, J. Ballesteros-Paredes, et. al.
Fri, 30 Sep 16
27/75
Comments: Submitted to ApJ
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