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We consider the largest sample of 561 edge-on galaxies observed with integralfield units by the MaNGA survey and find 300 galaxies where the ionised gasshows a negative vertical gradient (lag) in its rotational speed. We introducethe stop altitude as the distance to the galactic midplane at which the gasrotation should stop in the linear approximation. We find correlations betweenthe lags, stop altitude and galactic mass, stellar velocity dispersion andoverall Sersic index. We do not find any correlation of the lags or stopaltitude with the star formation activity in the galaxies. We conclude that lowmass galaxies (log(M*/Mo) < 10) with low Sersic index and with low stellarvelocity dispersion posses a wider "zone of influence" in the extragalactic gassurrounding them with respect to higher mass galaxies that have a significantspherical component. We estimated the trend of the vertical rotational gradientwith radius and find it flat for most of the galaxies in our sample. A smallsubsample of galaxies with negative radial gradients of lag has an enhancedfraction of objects with aged low surface brightness structures around them(e.g. faint shells), which indicates that noticeable accretion events in thepast affected the extraplanar gas kinematics and might have contributed tonegative radial lag gradients. We conclude that an isotropic accretion of gasfrom the circumgalactic medium plays a significant role in the formation ofrotation velocity lags.

SDSS IV MaNGA -- Gas Rotation Velocity lags in the Final Sample of MaNGA Galaxies