Dia: Dimecres, 17 de juliol de 2024
Lloc: Aula T2 (segon pis), Facultat de Matemàtiques i Informàtica, UB.A càrrec de: Patricia Sanchez Martin, UPC
Títol: Exploring galactic dynamics from single-time data
Resum: The dynamical systems approach to studying galactic shape and dynamics involves analyzing barred galaxies as a dynamical system governed by a gravitational potential created by the building blocks of the galaxy. The associated invariant manifolds of the planar family of Lyapunov orbits around the unstable equilibrium points delineate the arms and rings of barred galaxies. Orbits within these manifolds facilitate the transfer of matter between the inner and outer regions of the galaxy, with the Lyapunov orbits serving as gateways.
We aim to use the recent Gaia DR3 data release, which provides highly accurate positions and velocities of stars in the Milky Way and nearby regions, such as the Large Magellanic Cloud, at a single moment in time. This dataset presents a unique opportunity to validate our dynamical systems approach to explaining galactic features. There is a pressing need for methods to identify key galactic features from a single snapshot. In this study, we introduce a novel approach to identify these features.
Once our method identifies the building blocks of the galaxy from a single snapshot, we will utilize the results to model the potentials of the components of the galaxy. Combined with the detected angular velocity of the bar, these potentials will be incorporated into the classical dynamical system model. Once validated through simulations, our methodology can be applied to data from the Large Magellanic Cloud, a barred galaxy known for its asymmetrical density distribution in the central region and arms.
This is joint work with J. Amorós (UPC) and J. Masdemont (UPC).
Last updated: Sun Jul 14 13:29:54 2024