Fig. 2
Upper: H2 0−0 S(4) towards HH 54C1/C2 is compared with 1−0 S(1) and 0−0 S(9). Spectra are normalized to their peak values. The vertical dashed line marks the systemic velocity (vLSR = + 2.4 km s-1, Bjerkeli et al. 2011). The two vertical dotted lines indicate the velocity of: the 0−0 S(4) peak at − 7 km s-1; and the 1−0 S(1) and 0−0 S(9) peaks at −15 km s-1. Lower: H2O (212 − 101), CO (15−14), and CO (2−1) towards HH 54B are compared with H2 0−0 S(4) at HH 54C1/C2. H2O, CO, and H2 are normalized to the peak of the bump feature in CO (2−1).
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