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tokens: S.B., D.R.G.S., and R.B. are thankful for funding through the DFG priority program “The Physics of the Interstellar Medium” (projects BO 4113/1-2, SCHL 1964/1-2, and BA 3706/3-2). T.G. acknowledges the Centre for Star and Planet Formation funded by the Danish National Research Foundation. D.R.G.S. is thankful for funding through Fondecyt regular (project code 1161247) and through the “Concurso Proyectos Internacionales de Investigación, Convocatoria 2015” (project code PII20150171). D.R.G.S. would also like to thank Basel PFB-06 CATA for funding. S.B. also acknowledges the kind hospitality of the Kavli Institute for Theoretical Physics (KITP), where this work has been completed, and Andrea Ferrara, Troels Haugbølle, and Raffaella Schneider, for fruitful discussions on this topic. We are indebted to Hiroyuki Hirashita for the derivation of the equations reported in the Appendix. This research was supported in part by the National Science Foundation under Grant No. NSF PHY11-25915. The plots of this paper have been obtained by using the YT tool (Turk et al. 2011 ). The simulations have been performed on the German HLRN cluster under the project nip00035.