Fig. 5.
Half light radius of the 220 GHz continuum rcont vs. 0.5 × FWHM of the CO(2–1) emission rCO. Red (black) symbols mark systems classified as AGN (non-AGN) based on optical spectroscopy. Filled symbols correspond to nuclei in interacting systems and empty symbols to nuclei in mergers (see Table 1). Blue encircled symbols are galaxies with excess nonthermal emission whose continuum size estimates might be inaccurate (Sect. 5.1.2). The green line is best linear fit excluding the nuclei with rcont upper limits. The dotted line indicates the 1:1 relation.
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