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Fig. 4

Fig. 4 Refer to the following caption and surrounding text.

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Multiphase overview of NGC 1427A. Each column shows the same tracer; each row shows a different property. The maps for MUSE-based emission lines show only measurements with S/N >10 (i.e., relative flux error <10%). For visualization, the ionized-gas velocity and dispersion maps are hybrid: spaxel-level values where S/N > 10, Voronoi-bin values elsewhere. Row 1 – surface brightness: NGFS ugi′ composite; MeerKAT H I column density (6" beam); and MUSE maps of Hα, [S II] λλ6716, 6731, and [O III] λλ4959, 5007 flux. Row 2 – line-of-sight velocity: stellar pPXF velocity, H I moment–1, and hybrid ionized–gas velocity maps (spaxel-level where S/N > 10, Voronoi-bin values elsewhere). All five panels share the color bar on the right. In all but the last panel, the systemic-velocity contour (v = 2035 km s−1) is highlighted within the μ0 + 2 isophote to guide the eye to the approximate zero-velocity line. Row 3-velocity dispersion: stellar, H I, Hα, [S II], and [O III] dispersions with individual color bars below each panel. Overlaid on each frame are the contours for spatial reference. These isophotes were calculated over the NGFS u′ + g′ + i′ image. From the brightest isophote with surface brightness μ0, the others show μ0 + 1, μ0 + 2, and μ0 + 4.5, with no spatial smoothing. A 1 kpc bar is shown in the top-left corner of every panel (distance adopted: 17 Mpc).

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