Fig. 1.
Observational data of Messier 33. Left panel: HI column density map (VLA, 100 pc resolution, logarithmic stretch) with Spitzer/IRAC 3.6 μm stellar distribution overlaid (gray contours, showing the 0.1, 0.3, 0.5, 0.7, 0.9, 1.4, and 2.5 MJy sr−1 levels). Right panel: observed HI velocity dispersion (VLA, 100 pc resolution, not corrected for the instrumental dispersion), with HI column densities contours (1, 2, 3 × 1021 cm−2). The dashed line represents the location of the major axis of the inner unwarped disk, with position angle of 22.5°. Concentric ellipses show the projected locations of R = 2, 4, 6 kpc.
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