To access the full text documents, please follow this link: http://hdl.handle.net/2117/101062

Title:	Warp evidence in precessing galactic bar models
Author:	Sanchez Martin, P; Romero Gómez, Mercè; Masdemont Soler, Josep
Other authors:	Universitat Politècnica de Catalunya. Departament de Matemàtiques; Universitat Politècnica de Catalunya. SD - Sistemes Dinàmics de la UPC
Abstract:	Most galaxies have a warped shape when they are seen edge-on. The reason for this curious form is not completely known so far, so in this work we apply dynamical system tools to contribute to its explanation. Starting from a simple, but realistic model formed by a bar and a disc, we study the effect of a small misalignment between the angular momentum of the system and its angular velocity. To this end, a precession model was developed and considered, assuming that the bar behaves like a rigid body. After checking that the periodic orbits inside the bar continue to be the skeleton of the inner system even after inflicting a precession to the potential, we computed the invariant manifolds of the unstable periodic orbits departing from the equilibrium points at the ends of the bar to find evidence of their warped shapes. As is well known, the invariant manifolds associated with these periodic orbits drive the arms and rings of barred galaxies and constitute the skeleton of these building blocks. Looking at them from a side-on viewpoint, we find that these manifolds present warped shapes like those recognised in observations. Lastly, test particle simulations have been performed to determine how the stars are affected by the applied precession, this way confirming the theoretical results.
Abstract:	Peer Reviewed
Subject(s):	-Àrees temàtiques de la UPC::Matemàtiques i estadística -Celestial mechanics -Differentiable dynamical systems -Galaxies: kinematics and dynamics -galaxies: structure -galaxies: spiral -spiral galaxies -3-dimensional bars -orbital dynamics -building-blocks -periodic orbits -3-body problem -cosmic infall -thick -milky -resonances -Mecànica celest -Sistemes dinàmics diferenciables
Rights:	http://creativecommons.org/licenses/by-nc-nd/3.0/es/
Document type:	Article - Published version Article
Published by:	EDP Sciences
Share:

Show full item record