SDSS-IV MaNGA: global properties of kinematically misaligned galaxies

We select 456 gas-star kinematically misaligned galaxies from the internal Product Launch-10 of MaNGA survey, including 74 star-forming (SF), 136 green-valley (GV), and 206 quiescent (QS) galaxies. We find that the distributions of difference between gas and star position angles for galaxies have three local peaks at similar to 0 degrees, 90 degrees, and 180 degrees. The fraction of misaligned galaxies peaks at log (M-*/M-circle dot) similar to 10.5 and declines to both low- and high-mass end. This fraction decreases monotonically with increasing star formation rate and specific star formation rate. We compare the global parameters including gas kinematic asymmetry V-asym, H I detection rate and mass fraction of molecular gas, effective radius R-e, Sersic index n as well as spin parameter lambda(Re) between misaligned galaxies and their control samples. We find that the misaligned galaxies have lower III detection rate and molecular gas mass fraction, smaller size, higher Sersic index, and lower spin parameters than their control samples. The SF and GV misaligned galaxies are more asymmetric in gas velocity fields than their controls. These pieces of observational evidence point to the gas accretion scenario followed by angular momentum redistribution from gas-gas collision, leading to gas inflow and central star formation for the SF and GV misaligned galaxies. We propose three possible origins of the misaligned QS galaxies: (1) external gas accretion, (2) merger, and (3) GV misaligned galaxies evolve into QS galaxies.