H I integrated intensity (moment 0 map) of the ESO 179-013 system shown over different velocity ranges. The middle ellipse highlights galaxy A; the largest ellipse marks the ring; the northeastern circle identifies galaxy B; and the small ellipse to the west indicates galaxy C. (a) Full velocity range, 675–1050 km s⁻¹, highlighting the extended gas envelope; (b) three-dimensional visualization of ESO 179-013 showing isosurface levels at different neutral hydrogen column densities; the interactive version allows rotation, zooming, and panning of the 3D rendering and enables toggling of individual H I isodensity layers; (c) 675–777 km s⁻¹, gas component of galaxy B; (d) 777–900 km s⁻¹, emission from the ring, galaxy C, and the interaction among group members; (e) 900–1050 km s⁻¹, emission dominated by galaxy D. Black ellipses mark the optical radii of the three known galaxies and the best-fitting ellipse to the ring. The black continuous line in panels (a) and (b) indicates the plume possibly associated with galaxy B. The black filled circle in panel (a) is the beam.

An interactive version of this figure is available in the online article.

An interactive version of this figure is available.

An interactive version of this figure is available in the online journal.