Warp evidence in precessing galactic bar models

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...

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Detalles Bibliográficos
Autores: Sánchez Martín, Patricia, Romero Gómez, Mercè, Masdemont Soler, Josep
Tipo de recurso: artículo
Estado:Versión publicada
Fecha de publicación:2016
País:España
Institución:Varias* (Consorci de Biblioteques Universitáries de Catalunya, Centre de Serveis Científics i Acadèmics de Catalunya)
Repositorio:Recercat. Dipósit de la Recerca de Catalunya
OAI Identifier:oai:recercat.cat:2445/127865
Acceso en línea:https://hdl.handle.net/2445/127865
Access Level:acceso abierto
Palabra clave:Galàxies
Cúmuls d'estels
Galaxies
Clusters of stars
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spelling Warp evidence in precessing galactic bar modelsSánchez Martín, PatriciaRomero Gómez, MercèMasdemont Soler, JosepGalàxiesCúmuls d'estelsGalaxiesClusters of starsMost 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.EDP Sciences2019201920162019info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionapplication/pdfhttps://hdl.handle.net/2445/127865Articles publicats en revistes (Física Quàntica i Astrofísica)reponame:Recercat. Dipósit de la Recerca de Catalunyainstname:Varias* (Consorci de Biblioteques Universitáries de Catalunya, Centre de Serveis Científics i Acadèmics de Catalunya)InglésReproducció del document publicat a: https://doi.org/10.1051/0004-6361/201527302Astronomy & Astrophysics, 2016, vol. 588https://doi.org/10.1051/0004-6361/201527302(c) The European Southern Observatory (ESO), 2016info:eu-repo/semantics/openAccessoai:recercat.cat:2445/1278652026-05-29T05:05:01Z
dc.title.none.fl_str_mv Warp evidence in precessing galactic bar models
title Warp evidence in precessing galactic bar models
spellingShingle Warp evidence in precessing galactic bar models
Sánchez Martín, Patricia
Galàxies
Cúmuls d'estels
Galaxies
Clusters of stars
title_short Warp evidence in precessing galactic bar models
title_full Warp evidence in precessing galactic bar models
title_fullStr Warp evidence in precessing galactic bar models
title_full_unstemmed Warp evidence in precessing galactic bar models
title_sort Warp evidence in precessing galactic bar models
dc.creator.none.fl_str_mv Sánchez Martín, Patricia
Romero Gómez, Mercè
Masdemont Soler, Josep
author Sánchez Martín, Patricia
author_facet Sánchez Martín, Patricia
Romero Gómez, Mercè
Masdemont Soler, Josep
author_role author
author2 Romero Gómez, Mercè
Masdemont Soler, Josep
author2_role author
author
dc.subject.none.fl_str_mv Galàxies
Cúmuls d'estels
Galaxies
Clusters of stars
topic Galàxies
Cúmuls d'estels
Galaxies
Clusters of stars
description 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.
publishDate 2016
dc.date.none.fl_str_mv 2016
2019
2019
2019
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv https://hdl.handle.net/2445/127865
url https://hdl.handle.net/2445/127865
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv Reproducció del document publicat a: https://doi.org/10.1051/0004-6361/201527302
Astronomy & Astrophysics, 2016, vol. 588
https://doi.org/10.1051/0004-6361/201527302
dc.rights.none.fl_str_mv (c) The European Southern Observatory (ESO), 2016
info:eu-repo/semantics/openAccess
rights_invalid_str_mv (c) The European Southern Observatory (ESO), 2016
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv EDP Sciences
publisher.none.fl_str_mv EDP Sciences
dc.source.none.fl_str_mv Articles publicats en revistes (Física Quàntica i Astrofísica)
reponame:Recercat. Dipósit de la Recerca de Catalunya
instname:Varias* (Consorci de Biblioteques Universitáries de Catalunya, Centre de Serveis Científics i Acadèmics de Catalunya)
instname_str Varias* (Consorci de Biblioteques Universitáries de Catalunya, Centre de Serveis Científics i Acadèmics de Catalunya)
reponame_str Recercat. Dipósit de la Recerca de Catalunya
collection Recercat. Dipósit de la Recerca de Catalunya
repository.name.fl_str_mv
repository.mail.fl_str_mv
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score 15,811543

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