Effects of asymmetric galactic bars on radial velocity maps

Abstract

This study aimed to determine the effects of asymmetric bars on the kinematic behaviour of the inner regions of barred galaxies using test particle simulations. The results of the work suggest that a galactic bar with a deviation of the centre of mass produces asymmetries in the quadrupole signature of radial velocity maps, with the modulus of vr being larger in the direction of larger mass. It has been further confirmed that the larger the displacement of the centre of mass, the more significant the asymmetries in the radial velocity there are. As an application, this study confirms that the LMC has an asymmetric galactic bar and, for the first time, links this asymmetry in density with the asymmetry found in the galactic maps, as previously suggested by observations from the Gaia mission (ESA).