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Fig. 1

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Left panel: IRAS 4A combining SMA sub-compact, compact and extended configurations with robust parameter set to 0.5. The stars mark the two compact sources (see central panel). Top-right corner shows the u,v range used. The synthesized beam is 124  ×  112. Contours show the dust emission at 880 μm in steps of 6σ, from 6σ to 96σ, where σ = 0.02 Jy beam-1. The pixel map shows the polarized intensity (see scale on the right-hand side). Blue bars show the observed magnetic field direction. Central panel: IRAS 4A compact components. Legends are the same as in the left panel. The u,v range is restricted to the longest baselines. The synthesized beam is 070  ×  046. Contours range from 6σ to 36σ. Right panel: IRAS 4A envelope emission (see Sect. 2.1). Legends are the same as in the left panel. Contours range from 6σ to 48σ.

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