Shocks Within HH 47A

A schematic of the shock fronts in the HH 47A region. The velocities listed are with respect to the star. Fast jet gas overtakes the dense material within HH 47A at the Mach disk, and this dense material in turn overtakes slower jet material at the bow shock. Weak secondary shocks within the dense material should be strongly magnetized. The densities and velocities shown are for the `60/40' model described in the text.