(a): Comparison of 3C 120 with other GeV γ-ray radio galaxies. The red asterisks represent FR I radio galaxies, while the green circles denote FR II ones. The sources enclosed by black circles demonstrate significant (> 99%) long-term GeV γ-ray variability (Ballet et al. 2023). Note that M 87 exhibits pronounced variability in the TeV γ-ray domain. The yellow shaded area represents the optimal declination range for IceCube’s effective area. (b): Comparison between 3C 120 and neutrino-emitting candidates. The blue shapes represent blazars, the red shapes correspond to the radio galaxy 3C 120, and the green shapes denote the Seyfert II galaxy NGC 1068. Since other radio-quiet Seyfert galaxy candidates are not included in 4FGL-DR4 (Ballet et al. 2023), they are not plotted here.