An analytical model to kinematically identify thin discs in MaNGA galaxies

ABSTRACT We present an analytical model to identify thin discs in galaxies, and apply this a sample of SDSS MaNGA galaxies. This fits the velocity dispersion fields galaxies with regular kinematics. By introducing two parameters ? related comparison model’s asymmetric drift correction observed gas kinematics ? dominant component galaxy, we classify as ‘disc-dominated, ‘non-disc-dominated’, or ‘disc-free’ indicating dominating disc, non-dominating no disc detection our method, respectively. The dynamical mass resulting from correlates stellar mass, investigate discrepancies by including variation initial function. As expected, most spiral are disc-dominated, while ellipticals predominantly disc-free. Lenticular show dichotomy their kinematic classification, which is different star formation rates fractions. propose possible scenarios explain these results. In first scenario, disc-free lenticulars formed more violent processes than disc-dominated ones, second quenching lead change structures evolve ones.