Oral Presentation

Effects of non-circular motions in galaxies: from low-resolution IFS-galaxy surveys to high-spatial-resolution.

Author(s): Carlos Lopez-Coba (ASIAA)

Presenter: Carlos Lopez-coba (ASIAA)

Particles in disk galaxies (i.e., gas and stars) are expected to follow circular orbits around an almost fixed kinematic centre, with orbits dictated by the gravitational potential; therefore kinematic models that intend to recover the rotation of galaxies, often assume circular rotation to recover rotational curves. However, nonaxysismmetric components of galaxies such as spiral arms, bulge, stellar bars, etc; induce noncircular motions that can not be accounted for with the assumption of pure-circular rotation models; therefore complicating the interpretation of projected velocity field or the LOSV.
How the contribution of noncircular motions in galaxies affects their global and local properties is not fully understood; radial (in/out)flows are the main interpretation of such noncircular flows, although the real source and its kinematic profile are more complicated. Since kinematics is a direct measure of the gravitational potential, quantifying the effects of noncircular motions becomes extremely important for understanding the dynamical and chemical evolution of galaxies.
This work presents the implementation of a novel method based on Bayesian inference (MCMC and Nested sampling) to recover the circular and noncircular rotation from disk galaxies. We show the results of this applied to stellar and ionized gas kinematics maps from a sample of barred galaxies from the MUSE spectrograph. We show that in galaxies hosting bars, the kinematics of gas and stars is described by bisymmetric motions induced by the stellar bar potential.
In addition, using SF galaxies from the MaNGA galaxy survey I show the implications of taking into account noncircular motions in some global scaling relations such as the Tully-Fisher and SFMS.