Difference Image of the HH 47 Jet

An H-alpha minus [S II] difference image of the HH 47 jet based on HST images. [S II]-strong regions are black, and H-alpha-strong regions are white. The wisps and filaments seen in the H-alpha image are located at the edges of the [S II]-bright jet where it shows abrupt changes in direction. Field stars do not subtract out, because the [S II] filter is much wider than the H-alpha filter. The reflection nebula has almost disappeared because by chance the presence of H-alpha emission from the embedded T Tauri star compensates for the wider bandwidth of the [S II] filter.