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Fig. 2

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Column density distribution of the gas cloud overlaid with equipotential lines for Setup 2-DD (see Table 2 for its parameters) at a maximum refinement level of 7 (effective spatial resolution: 5 pc): without DM halo (left panels, Run VI) and with DM halo of scale radius r0 = 250 pc (right panels, Run IX). The contour lines of the grayscale Hi column density distribution range between log (NHi) = 18.8...21.2   cm-2 in steps of 0.3 dex. Overlaid are the equipotential lines of the total gravitational potential by the gaseous cloud, the DM subhalo of the cloud (if present), and the external galaxy (see text) in steps of 2.5 × 1011   cm2   g-2. In red, the equipotential line of the innermost Lagrangian point is depicted. Top panels show the initial distributions, bottom panels after a simulation time of 100 Myr. (Step-like contour lines reflect the coarser grid farther away from the cloud.)

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