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We consider the circumnuclear regions of MaNGA galaxies. The spectra areclassified as AGN-like, HII-region-like (or SF-like), and intermediate (INT)spectra according to their positions on the BPT diagram. There are thefollowing four configurations of the radiation distributions in thecircumnuclear regions: 1) AGN+INT, the innermost region of the AGN-likeradiation is surrounded by a ring of radiation of the intermediate type; 2)INT, the central area of radiation of the intermediate type; 3) SF+INT, theinner region of the HII-region-like radiation is surrounded by a ring ofradiation of the intermediate type; and 4) SF, the HII-region-like radiationonly. The LINERS of configurations 1 and 2 are examined. The spaxel spectra ofthe LINERs form a sequences on the BPT diagram. The line ratios change smoothlywith radius, from AGN-like at the center to HII-region-like at largerdistances. This is in agreement with the paradigm that the LINERs are excitedby AGN activity. The AGN and INT radiation in the circumnuclear region isaccompanied by an enhanced gas velocity dispersion, s_g. The radius of the areaof the AGN and INT radiation is similar to the radius of the area with enhanceds_g, and the central s_g,c correlates with the luminosity of the AGN+INT area.We assume that the gas velocity dispersion can serve as an indicator of the AGNactivity. The values of s_g,c for the SF-type centers partly overlap with thoseof the AGN-type centers. We find that there is a demarcation line between thepositions of the AGN-type and SF-type objects on the s_g,c - central Halphasurface brightness diagram.

Circumnuclear regions of different BPT types in star-forming MaNGA galaxies: AGN detectability