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dc.contributor.authorSánchez Martín, Patricia
dc.contributor.authorMasdemont Soler, Josep
dc.contributor.authorRomero Gómez, Merce
dc.contributor.otherUniversitat Politècnica de Catalunya. Departament de Matemàtiques
dc.identifier.citationSánchez-Martin, P.; Masdemont, J.J.; Romero, G. From manifolds to Lagrangian coherent structures in galactic bar models. "Astronomy & astrophysics", 16 Octubre 2018, vol. 618, p. A72-1-A72-14.
dc.description.abstractWe study the dynamics near the unstable Lagrangian points in galactic bar models using dynamical system tools in order to determine the global morphology of a barred galaxy. We aim at the case of non-autonomous models, in particular with secular evolution, by allowing the bar pattern speed to decrease with time. We have extended the concept of manifolds widely used in the autonomous problem to the Lagrangian coherent structures (LCS), widely used in fluid dynamics, which behave similar to the invariant manifolds driving the motion. After adapting the LCS computation code to the galactic dynamics problem, we apply it to both the autonomous and non-autonomous problems, relating the results with the manifolds and identifying the objects that best describe the motion in the non-autonomous case. We see that the strainlines coincide with the first intersection of the stable manifold when applied to the autonomous case, while, when the secular model is used, the strainlines still show the regions of maximal repulsion associated to both the corresponding stable manifolds and regions with a steep change of energy. The global morphology of the galaxy predicted by the autonomous problem remains unchanged
dc.publisherEDP Sciences
dc.rightsAttribution-NonCommercial-NoDerivs 3.0 Spain
dc.subjectÀrees temàtiques de la UPC::Matemàtiques i estadística
dc.subject.lcshStellar dynamics
dc.subject.otherGalaxies: kinematics and dynamics
dc.subject.othergalaxies: spiral
dc.subject.othergalaxies: structure
dc.titleFrom manifolds to Lagrangian coherent structures in galactic bar models
dc.subject.lemacDinàmica estel·lar
dc.contributor.groupUniversitat Politècnica de Catalunya. SD - Sistemes Dinàmics de la UPC
dc.description.peerreviewedPeer Reviewed
dc.rights.accessOpen Access
dc.description.versionPostprint (published version)
upcommons.citation.authorSánchez-Martin, P.; Masdemont, J.J.; Romero, G.
upcommons.citation.publicationNameAstronomy & astrophysics

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