Possible origin of the radio emission detected in our sample of MaNGA AGN candidates. The grey solid line represents the one-to-one relation of the expected luminosity of each possible origin. The grey dotted line represents the luminosity 3σ above the expected luminosity for each possible origin. Unseen error bars are smaller than the size of the plotted symbols. Top: Under the assumption that the radio emission is thermal bremsstrahlung (i.e., the origin of the emission is star formation), the 6 GHz luminosity density of our sources versus the expected luminosity of the star formation has been plotted. Middle: 6 GHz luminosity densities of our sources versus the expected luminosity of individual SNR-SN. Bottom: 6 GHz luminosity densities of our sources versus the expected cumulative luminosity of the SNRs-SNe population. Sources above the 3σ expected luminosity cannot be explained by the specific mechanism since individual regions cannot have luminosities that exceed what is expected for each mechanism in the entire galaxy. Sources below this region can have their origin in each specific mechanism.