Collisionally excited filaments in HST H$\alpha$ and H$\beta$ images of HH~1/2

A. C. Raga, B. Reipurth, A. Castellanos-Ramírez +2

We present new H$\alpha$ and H$\beta$ images of the HH~1/2 system, and we find that the H$\alpha$/H$\beta$ ratio has high values in ridges along the leading edges of the HH~1 bow shock and of the br…