Fig. 4.
Top panel: rotation curve (RC) of NGC 5257 derived from scanning Fabry–Perot (FP) observations of the ionized gas. Dark circles represent velocities on the receding side of the galaxy; light squares indicate velocities on the approaching side of the galaxy. Bottom panel: RC of NGC 5258. Dark circles represent velocities on the receding side of the galaxy; light squares indicate velocities on the approaching side of the galaxy. Solid lines show the parametric fit of each RC discussed in Sect. 4.4.2. Arrows indicate the position of Rbif discussed in Sect. 4.3.
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