Fig. 2
Composite-color image of the S 1 PDR derived using the 3.6, 4.5, and 8 μm Spitzer observations (Padgett et al. 2008). Also shown is a cartoon of the morphology of the PDR that is derived in this paper on the basis of the spatial and velocity dependence of emissions in multiple tracers. The red and blue surfaces show the red- and blueshifted fronts of the PDR. The color map corresponds to N2 H+ emission (Larsson & Liseau 2017) from the molecular cloud to the west. The yellow line demarcates the boundary of the PDR as identified from our [C II] observations and the 8 μm emission.
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