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Fig. 1


Continuum-subtracted H2 1-0S(1) images of IRS54. Panels a) and c): average over two spectral channels at − 64 km s-1 and –30 km s-1 (panel a)), and +40 km s-1 and +75 km s-1 (panel c)). Panel b): single spectral channel at +6 km s-1. The velocities are corrected from an average cloud velocity of 3.5 km s-1 (Wouterloot et al. 2005; André et al. 2007). Panel d): average H2 1-0S(1) emission over the previous velocity channels. Overplotted are the locations of six spatial regions where spectra were extracted. For reference, contours of the continuum (near the H2 2.122 μm line) down to the FWHM size have been overplotted at the centre of every image (dashed-blue contours). Contours in all panels show values of 1.3, 2.9, 4.5, 5.3, 6.1, 7.7, 9.3 × 10-14 erg s-1 cm-2μm-1.

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