High-velocity [O III]λ5007 emission line flux across the FOV obtained by integrating for each spaxel the spectra in the regions 4890 − 5004 Å and 5014 − 5030 Å, which correspond to absolute velocities > 250 km s−1 with respect to the reference frame of the NW nucleus. The map was obtained after subtracting the stellar contribution (using pPXF best-fit spaxel spectra). Solid contours refer to the S/N = 10 and 40 levels in the stellar continuum map. Different spectra, extracted from the regions labelled in the flux maps, are also shown in the insets, with normalised fluxes; blue and red spectra in inset (b) show the most asymmetric line profiles and are extracted from the 3 × 3 pixel regions shown in the central panel with blue and red squares, respectively. Vertical dashed lines indicate the (NW nucleus systemic) wavelength of the [O III]λ5007 line; dotted lines refer to ±250 km s−1 with respect to the NW nucleus systemic velocity.
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