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Fig. 1

image

L1157 southern blueshifted lobe in CO (1–0) (white contours; Gueth et al. 1996). 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(J2000) = 20h39m10s.2, δ(J2000) = + 68°01′10′′.5 (Δα = +25′′ and Δδ = −63′′.5 from the L1157-mm protostar). Top panel: map (in colour scale) of the emission due to the CH3 OH(21,2–11,1) A transition (integrated over the whole velocity range). The first contour and step are 3σ (32 mJy beam−1 km s−1). For the CO image, the first contour and step are 6σ (1σ = 0.5 Jy beam−1 km s−1) and 4σ, respectively. The dashed circle shows the primary beam of the CH3OH image (64′′). Yellow labels are for the B0 and B1 clumps (black triangles) previously identified using molecular tracers (see text, and e.g. Benedettini et al. 2007; Codella et al. 2009, 2017). The white and magenta ellipses depict the synthesised beams of the CO (3′′.65×2′′.96, PA = +88°), and CH3 OH (2′′.97×2′′.26, PA = –155°) observations, respectively. Bottom panel: same as top panel but for CH3CHO (50,4 –40,4) E. The first contour and step are 3σ (7 mJy beam−1 km s−1). The synthesised beams of the CH3CHO image are similar to those of the CH3OH map.

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