Fig. A.2

L1157 southern blueshifted lobe in CO (1–0) (white contours; Gueth et al. 1996) and NH2 CHO (41,4 –31,3) (cyan contours; Codella et al. 2017). The precessing jet ejected by the central object L1157-mm (outside the frame and toward the northwest) excavated several clumpy cavities, named B0, B1, and B2, respectively. The maps are centred at α(J 2000) = 20h 39m10s.2, δ(J2000) = +68°01′10′′.5 (Δα = +25′′ and Δδ = –63′′.5 from L1157-mm). For the CO image, the first contour and step are 6σ (1σ = 0.5 Jy beam−1 km s−1) and 4σ, respectively. The first contour and step of the NH2CHO map (cyan contours) correspond to 3σ (15 mJy beam−1 km s−1) and 1σ, respectively. The dashed circle shows the primary beam of the CH3CHO images(64′′). Upper panels: map (in colour scale) of line emission (integrated over the whole velocity range) due to CH3 CHO (50,4 –40,4) E, (50,4 –40,4) A, (51,4–41,3) E, and (51,4–41,3) A, respectively. The first contour and step are 3σ: 7 mJy beam−1 km s−1 (50,4 –40,4 E, 50,4 –40,4 A), and 8 mJy beam−1 km s−1 (51,4 –41,3 E, and 51,4–41,3 A). The cyan, white, and magenta ellipses depict the synthesised beams of the NH2 CHO (5′′.79 × 4′′.81, PA = –94°), CO (3′′.65 × 2′′.96, PA = +88°), and CH3CHO (2′′.97 × 2′′.26, PA = –155°) observations, respectively). Yellow labels are for the B0, B1, and B2 regions: the positions of the different clumps inside these regions are shown in Fig. 1 (see also text, and e.g. Codella et al. 2009, 2017). Lower panels: same as upper panels but for the CH3 CHO (52,4 –42,3) A, (52,4–42,3) E, (52,3 –52,2) E, and (52,3–42,2) A. The first contour and step are 3σ: 5 mJy beam−1 km s−1 for 52,4 –42,3 A,E, and 4 mJy beam−1 km s−1 for 52,3 –52,2 A,E.
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