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Appendix A: The 3.2 mm continuum emission
Figure A.1 shows the emission map of the 3.2 mm continuum dust emission, which was produced as the 1.4 mm map using robust weighting, and restored with a clean beam of 
(PA = 38°). The 3.2 mm emission allows us to detect the MM1 (α(J2000): 03h 28m 55
56, δ(J2000): +31° 14′ 36
93) and MM2 (α(J2000): 03h 28m 5569, δ(J2000): +31° 14′ 3563) sources, consistent with what was found in the 1.4 mm image (see Table 1 and Fig. 1). The peak fluxes are 17 mJy beam-1 and 2 mJy beam-1 for MM1 and MM2, respectively. On the other hand, MM3 (revealed at 1.4 mm) is not detected at a 3σ sensitivity level of 0.75 mJy beam-1.
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Fig. A.1
Contour plots of the IRAS2A continuum emission at 3.2 mm. The ellipse shows the PdBI synthesised beam (HPBW): |
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Appendix B: SiO and SO channel maps
We show in Figs. A.1 and A.2 the channel maps of the SiO(5–4) and SO(65–54) blue- and redshifted (continuum subtracted) emissions towards IRAS2A. The images trace the clumps well at different velocities along the N-S jet driven by MM1 and also trace the redshifted E lobe associated with MM2. The grey lines show the deceleration of the highest velocity clumps.
Figure A.3 shows the SiO and SO PV diagrams along the E-W jet axis: as in the N-S case, the SiO emitting at the highest velocities is closely associated with the driving source MM2, confirming that SiO is a powerful tracer of the jet launching region.
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Fig. B.1
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): |
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Fig. B.2
Channels map of the SO(65–54) blue- and redshifted (continuum subtracted) emissions towards IRAS2A. Each panel shows the emission integrated over a velocity interval of 2.7 km s-1 centred at the value given in the upper-right corner. Symbols are drawn as in Fig. 2. The ellipse in the top-left panel shows the PdBI synthesised beam (HPBW): |
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Fig. B.3
Position-velocity cut of SiO(5–4) (grey scale and black contours) and SO(65–54) (magenta contours) along the whole E-W jet (PA = 105°, see the grey line in Fig. 1). First contours and steps correspond to 5σ (2.5 K for SiO and 4.0 K for SO) and 3σ, respectively. Dashed lines mark the positions of MM2 and the protostellar envelope VLSR (+6.5 km s-1). We note that the SiO and SO emission at negative angular offsets traces the N-S outflow driven by MM1 (see Fig. 1). |
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© ESO, 2014