Fig. 9
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Schematic representation of IRS 44. The quiescent SO2 emission (knot) would be part of a streamer that allows material to fall into the disk-envelope through the redshifted protrusion and generate accretion shocks. These shocks sublimate SO2 molecules from dust grains and enhance the SO2 gaseous abundance, showing an emission peak ~0″.1 to the south of the protostar.
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