MaNGA galaxies with off-centered spots of enhanced gas velocity
  dispersion
  Off-centered spots of the enhanced gas velocity dispersion, s, are revealed
in some galaxies from the MaNGA survey. Aiming to clarify the origin of the
spots of enhanced s, we examine the distributions of the surface brightness,
the line-of-sight velocity, the oxygen abundance, the gas velocity dispersion,
and the BPT spaxel classification in seven galaxies. We find that the enhanced
s spots in six galaxies can be attributed to a (minor) interaction with a
satellite. Three galaxies in our sample have a very close satellite. The spots
of enhanced s in those galaxies are located at the edge of the galaxy close to
the satellite. The spots of enhanced s in three other galaxies are related to
bright spots in the photometric B band within the galaxy, which can be due to
the projection of a satellite in the line of sight of the galaxy. The oxygen
abundances in the spots in these three galaxies are reduced. This suggests that
the low-metallicity gas from the satellite is mixed with the interstellar
medium of the disk. The spectra of the spaxels within a spot are usually
HII-region-like, suggesting that the interaction in those galaxies does not
result in appreciable shocks. In contrast, the spot of the enhanced s in the
galaxy M-8716-12703 is associated with an off-centered AGN-like radiation
distribution. One can suggest that the spot of the enhanced s in the
M-8716-12703 galaxy is different in origin, or that the characteristics of gas
infall in this case differs from that in other galaxies.
