Channel maps around the CO lines. The white circles indicate the positions of the Spitzer images A and B (Gonzalez et al. 2009). Each channel has a width of ~300 km s-1 and the central velocity of each channel is noted in the upper left corners. The beam is shown in the bottom left corner and the color bars show the range of surface brightnesses, in Jy beam-1. Top row: channel maps at 3 mm, the band into which the CO(3–2) line is redshifted. Emission is clearly seen near image B (the western image) in the third panel. Faint emission near image A is seen in the third panel. Bottom row: channel maps at 7 mm, the band into which the CO(1–0) line is redshifted. Emission is detected close to images A and B and is best seen in the third panel. The continuum source discussed in Sect. 3.2.1 lies outside the field displayed here. The velocity v = 0 corresponds to a redshift of z = 2.7793. Positional offsets refer to the phase center in Table 1.
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