Centroids of NH3 absorption fitted in individual velocity channels (open squares), overlaid on the 1.3 cm continuum map (black image and white contours) imaged with the VLA in A-configuration (Moscadelli & Goddi 2014). Color denotes line-of-sight velocity (color scale on the right-hand side). The sizes of squares scale linearly with the flux density of NH3 absorption. The relative alignment between NH3 and 1.3 cm continuum is accurate to ~30 mas. We note that with a linear resolution of 200 AU, the compact core is resolved in two (northern and southern) components, that are unresolved in our VLA B-array images (Figs. 3 and 4). The southernmost component, separated by ~0.′′4 from the core, is not shown here. We also note that the NH3 absorption distributes between the two peaks of the radio continuum, shows a velocity gradient roughly N–S, and is strongest towards the southern component of the radio continuum.
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