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Fig. 1

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Spitzer/IRAC1 (Gutermuth et al. 2008) and CO 6–5 contours (Yıldız et al. 2012) are overlaid to illustrate the NGC 1333 IRAS 4A and 4B protostars. The white circle in the center represents the observed HIFI beam of 44″ centred on IRAS 4A, illustrating that it partially overlaps with the outer part of the IRAS 4B envelope. The contours indicate the outflows, with levels starting from 15 K km s-1 with an increasing step size of 30 K km s-1. Blue and red velocity ranges are selected from –20 to 2.7 and from 10.5 to 30 km s-1, respectively. The black dot on upper right corner shows the beam size of the CO 6–5 data.

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