Channel maps of the SiO(5–4) blue- and redshifted (continuum subtracted) emissions towards IRAS2A. Each panel shows the emission integrated over a velocity interval of 2.5 km s-1 centred at the value given in the upper-right corner. The thick box and the magenta contours indicate the range associated with the systemic velocity. Thick contours correspond to the 5σ emission of the 1.4 mm continuum map shown in Fig. 1 and indicate the position of the MM1, MM2, and MM3 continuum sources. The ellipse in the top-left panel shows the PdBI synthesised beam (HPBW): (PA = 33°). First contours and steps correspond to 5σ (15 mJy beam -1 km s-1) and 10σ, respectively. Grey lines indicate the slowing down of the highest velocity SiO clumps (see text).
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