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Fig. 4

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CO(1–0) and CO(3–2) spectra as functions of velocity and redshift, showing that both emission lines originate from gas at the same systemic velocity. The upper and middle panels show individual spectra toward the positions of image A and B. The lower panel shows the combined spectrum and the Gaussian model fitted to the CO(3–2) spectrum. The redshift derived from the CO lines is indicated (z = 2.7793, dashed line); it differs slightly from the redshift derived by G10 from PAH lines (z ~ 2.79, dotted line). The hashed region shows the spectral extent of the integrated images shown as contours in Fig. 3, from which we measured the flux of the CO lines. This velocity interval was determined from the combined CO(3–2) spectrum. The velocity resolution of both spectra is 80 km   s-1.

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