Fig. 5.
Left panel: central channel (at υ = 0 km s−1) of the CO emission. The spiral shape is clearly visible. Middle panel: a black dashed Archimedean spiral is plotted over the channel’s emission distribution, to guide the eye. Right panel: contour map of the central channel. Contours are drawn at 10, 15, 25, 45, and 65 times the rms noise value outside the line (1.25 × 10−3 Jy beam−1). The spiral exhibits a high degree of substructure, with voids and clumps. The central region of the spiral is bright and shows complexity beyond the expected spiral pattern.
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