Composite Hα (cyan) and 5900 Å continuum (red) image of 4C 12.50, constructed from Hubble Space Telescope data (Batcheldor et al. 2007). To enhance the visibility of low surface brightness structures, we removed all symmetric galaxy components (i.e., a common bulge and two residual disks located at the position of the two nuclei) from the 5900 Å image with GALFIT (Peng et al. 2002). Both disks were found to have an inclination of ~ 20°. Irregularly moving components are found within the IRS slit, marked with a yellow box for both nod positions. (A) marks the position of two super star clusters with velocities that are blueshifted by up to ~250 km s-1 from systemic velocity (Rodríguez Zaurín et al. 2007).
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