Near-infrared imaging of HH 1/2 in shocked molecular hydrogen and (Fe II)

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Abstract

We report here on near-infrared imaging of the HH 1/2 region in the H2 nu = 1 goes to 0 S(1) (2.121 micrometer) and (Fe II) (1.645 micrometer) lines. These observations reveal in detail the morphology of low and intermediate-velocity shocks in this area. In H2 only the eastern boundary of the HH 1 bow shock is observed, presumably because of an asymmetrical distribution of ambient gas. Diffuse emission is also seen northwest (downstream) of HH 1. The VLA 1 jet is found to be more continuous, but of a similar length compared to that in the optical. A bright H2 knot is found along the jet. Close to, and within, HH 2 we see evidence for the first time of a possible counter jet: in H2 the faint optical tail to the northwest of HH 2 is seen as a series of clumps, while a string of fainter knots runs through HH 2 (and along the outflow axis) toward its southeastern corner. Many of the H2 knots in HH 2 can be identified with corresponding optical knots, though there are clear differences in morphology and relative brightness. In particular their arc-shaped geometry in H2 is indicative of 'minibow shocks' which may result from a collection of 'bullets' within HH 2. Features in the (Fe II) images are in general similar to the brightest optical emission observed in the (S II) lambda lambda 6717, 6731 low-excitation lines.

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