Distribution of the 6.7 GHz CH3OH maser cloudlets detected within ~1 arcsec of Cepheus A HW2. The main panel shows the distribution of the maser cloudlets (colored dots) superimposed on a HC3N (27–26) v7 = 1e map (contours) integrated in the velocity range from − 7 to − 3 km s-1 (from Jiménez-Serra et al. 2009). HC3N contours start at 2σ by 2σ steps. The upper axis gives the linear scale of the map at a distance of 700 pc. Maser colors indicate the gas LSR velocity locally, according to the right-hand wedge. Maser groups are labeled according to Sugiyama et al. (2008b). The systemic velocity (Vsys) is set at − 4.5 km s-1. The black star marks the HW2 position according to Curiel et al. (2006). Insets: blow-up of the local maser emission (beam size at a bottom corner) summed within the VLSR range specified in each box (see Sect. 3). The gray logarithmic scale (top wedge) gives the brightness scale from 10σ up to the peak emission in Jy beam-1; the black contours give the brightness levels from 10% of the peak emission by 10% steps. The red arrows trace the proper motion vectors of the maser cloudlets; the arrow length indicates the position reached after a time of 40 yrs at the average velocity of 1.7 km s-1. Note that a few proper motions are associated with faint maser cloudlets that are not visible in the summed maps.
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