EDP Sciences
Free Access
Issue
A&A
Volume 581, September 2015
Article Number A91
Number of page(s) 7
Section Interstellar and circumstellar matter
DOI https://doi.org/10.1051/0004-6361/201526428
Published online 11 September 2015

Online material

Appendix A: CO channel maps

We show in Fig. A.1 the channel maps of the blue- and red-shifted ALMA CO(21) (continuum subtracted) emission towards VLA1623, which are analysed and discussed in the main text (see Sect. 3). The images clearly show two gas components that are well separated in velocity: a red-shifted cavity-like structure dominating the emission at low projected velocities (Ar1, Ar2, and Ar3 knots); and a collimated emission in the

higher-velocity channels (Br2, Br1, Bb1, and Bb2 knots along the cyan line) and associated with the closest [Oi] 63 μm peaks (see Fig. 1). In particular, compact high-velocity outflow emission is detected close to source B (Bb1 and Br1 knots). The channel maps of the blue- and red-shifted SMA CO(32) emission are also presented in Fig. A.2 for comparison. We note that the low-velocity blue-shifted emission between 0 and +3 km s-1 is resolved by the ALMA observations.

thumbnail Fig. A.1

Channel maps of the ALMA CO(21) emission. The velocity range of each map is indicated in the top left corner. The ALMA synthesised beam of the CO map is shown in the central panel. Contour levels of emission are traced at 3, 5, and 10σ levels and increase in steps of 10σ. Negative contours are displayed in black starting at 3σ level and decreasing in steps of 3σ. Black crosses represent the three protostars, which are labelled in the central panel. Other labels indicate the CO features discussed in the text (see also Fig. 2). Black and cyan solid lines are the same as in Fig. 1. The ALMA observations resolve the low-velocity blue-shifted emission (0, +3 km s-1) detected with SMA (see Fig. A.2), which is possibly associated with extended emission and, therefore, filtered out by our high-resolution ALMA interferometric observations.

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thumbnail Fig. A.2

Channel maps of the SMA CO(32) emission. The velocity range of each map is indicated in the top left corner. The SMA synthesised beam of 232 × 141 (PA = 55°) is shown in the central panel. Contour levels of emission are traced starting at 3σ levels and increasing in steps of 3σ. Negative contours are displayed in black starting at 3σ level and decreasing in steps of 3σ. Black crosses represent the three protostars, which are labelled in the central panel. Black and cyan solid lines are the same as in Fig. 1.

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© ESO, 2015

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