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The SDSS-IV MaNGA survey has measured two-dimensional maps of emission linevelocities for a statistically powerful sample of nearby galaxies. Theasymmetric features of these kinematics maps reflect the non-rotationalcomponent of a galaxy's internal motion of ionized gas. In this study, wepresent a catalog of kinematic asymmetry measurement of $H\alpha$ velocity mapof a sample of 5353 MaNGA galaxies. Based on this catalog, we find that`special' galaxies (e.g. merging galaxies, barred galaxies, and AGN hostgalaxies) contain more galaxies with highly asymmetric velocity maps. However,we notice that more than half of galaxies with high kinematic asymmetry in oursample are quite `regular'. For those `regular' galaxies, kinematic asymmetryshows a significant anti-correlation with stellar mass at $\log M_\star < 9.7$,while such a trend becomes very weak at $\log M_\star>9.7$. Moreover, at agiven stellar mass, the kinematic asymmetry shows weak correlations withphotometric morphology, star formation rate, and environment, while it isindependent of HI gas content. We also have quantified the observationaleffects in the kinematic asymmetry measurement. We find that both thesignal-to-noise ratio of $H\alpha$ flux and disk inclination angle contributeto the measures of kinematic asymmetry, while the physical spatial resolutionis an irrelevant factor inside the MaNGA redshift coverage.

The Velocity Map Asymmetry of Ionized Gas in MaNGA. I. The Catalog and General Properties