2010ApJ...723..449L

Numerical simulations of HH jets never show side entrainment of environmental material into the jet beam. This is because the bow shock associated with the jet head pushes the surrounding environment into a dense shell, which is never in direct contact with the sides of the jet beam. We present three-dimensional simulations in which a side-streaming motion (representing the motion of the outflow source through the surrounding medium) pushes the post-bow shock shell into direct contact with the jet beam. This is a possible mechanism for modeling well-collimated "molecular jets" as an atomic/ionic flow which entrains molecules initially present only in the surrounding environment.