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Astro-seminars
Exploring the imprints of nonaxisymmetric motions in disk galaxies. The case of NGC 1087, a barred galaxy or gas with inflow motions?Recording
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Europe/Madrid
Description
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. However, nonaxisymmetric components of galaxies such as spiral arms, bulge, stellar bars, etc, induce noncircular motions on the gas and stars that can not be accounted for with the assumption of pure-circular rotation models. Therefore, complicating the interpretation of the LOSV. How the contribution of noncircular motions in galaxies affects their global and local properties is not fully understood yet; radial (in/out)flows are commonly the main interpretation of such noncircular flows, although the real source and their kinematic radial profiles are more complicated. Given that 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.
In this talk, I will address the characterization of nonaxisymmetric motions in disk galaxies and I will show how kinematics can be used to detect bar-like motions and gas infows. I will show the case of NGC1087, a nearby galaxy that lacks an optical bar but exhibits bar-like flows in its stellar and gas kinematics.
Organized by
Enrica Bellocchi
