Fig. 4
(a) Distribution of the 22 GHz H2O maser features (colored symbols; Table 2) superposed on the VLA K-band continuum observed on December 27, 2016 (purple contours; Cesaroni et al. 2018) and the moment 0 map of the 321 GHz H2O maser emission (gray scale). Contour levels are 4, 8, 16, ... times the rms noise level of the 0.13 mJy beam−1 and the 32 mJy beam−1 km s−1 for the VLA K-band continuum and the moment 0 map of the 321 GHz H2O, respectively. The (0, 0) position is the phase tracking center, RA(J2000) = 06h12m54.006s and Dec = +17°59′22.96′′. The synthesized beam size of the ALMA Band 7 observation is shown in the bottom left corner of each panel. (b) Distribution of peak centroids of the 321 GHz H2O maser features (colored symbols) superposed on the ALMA Band 7 continuum (magenta contours) and the moment 0 map of the 321 GHz H2O maser emission (gray scale). Contour levels for the ALMA Band 7 continuum are 32, 64, and 128 times the rms noise level of 0.33 mJy beam−1, showing only the brightest part around the continuum peak.
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