Formation of asymmetric arms in barred galaxies

We establish a dynamical mechanism to explain the origin of the asymmetry between the arms observed in some barred disc galaxies, where one of the two arms emanating from the bar ends is very well defined, while the second one displays a ragged structure, extending between its ridge and the bar. To...

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Detalles Bibliográficos
Autores: Sánchez-Martín, P., García-Gómez, C., Masdemont, Josep J., Romero-Gómez, Mercè
Tipo de recurso: artículo
Estado:Versión publicada
Fecha de publicación:2023
País:España
Institución:Consejo Superior de Investigaciones Científicas (CSIC)
Repositorio:DIGITAL.CSIC. Repositorio Institucional del CSIC
OAI Identifier:oai:digital.csic.es:10261/336665
Acceso en línea:http://hdl.handle.net/10261/336665
Access Level:acceso abierto
Palabra clave:Galaxies: kinematics and dynamics
Galaxies: structure
Galaxies: spiral
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spelling Formation of asymmetric arms in barred galaxiesSánchez-Martín, P.García-Gómez, C.Masdemont, Josep J.Romero-Gómez, MercèGalaxies: kinematics and dynamicsGalaxies: structureGalaxies: spiralWe establish a dynamical mechanism to explain the origin of the asymmetry between the arms observed in some barred disc galaxies, where one of the two arms emanating from the bar ends is very well defined, while the second one displays a ragged structure, extending between its ridge and the bar. To this purpose, we study the invariant manifolds associated with the Lyapunov periodic orbits around the unstable equilibrium points at the ends of the bar. Matter from the galaxy centre is transported along these manifolds to the periphery, forming this way the spiral arms that emanate from the bar ends. If the mass distribution in the galaxy centre is not homogeneous, because of an asymmetric bar with one side stronger than the other, or because of a non-centred bulge, the dynamics about the two unstable Lagrange points at the ends of the bar will not be symmetric as well. One of their invariant manifolds becomes more extended than the other, enclosing a smaller section and the escaping orbits on it are fewer and dispersed in a wider region. The result is a weaker arm and more ragged than the one at the other end of the bar.P.S.M. thanks the Spanish Ministry of Economy for grant numbers PID2020-117066GB-I00 and PID2021-123968NB-I00. J.J.M. thanks MINECO-FEDER for the grant number PID2021-123968NB-I00 and the Catalan government for grant number 2017SGR-1049. M.R.G. thanks the Spanish Ministry of Science for grant number MICIU/FEDER RTI2018-095076-B-C21, and the Institute of Cosmos Sciences University of Barcelona (ICCUB, Unidad de Excelencia ‘María de Maeztu’) for grant number CEX2019-000918-M. Funding for the Sloan Digital Sky Survey IV has been provided by the Alfred P. Sloan Foundation, the U.S. Department of Energy Office of Science, and the Participating Institutions. SDSS (www.sdss.org) acknowledges support and resources from the Center for High-Performance Computing at the University of Utah.Peer reviewedOxford University PressMinisterio de Ciencia, Innovación y Universidades (España)Agencia Estatal de Investigación (España)European CommissionGeneralitat de CatalunyaAlfred P. Sloan FoundationDepartment of Energy (US)202320232023info:eu-repo/semantics/articlehttp://purl.org/coar/resource_type/c_6501Publisher's versioninfo:eu-repo/semantics/publishedVersionapplication/pdfhttp://hdl.handle.net/10261/336665reponame:DIGITAL.CSIC. Repositorio Institucional del CSICinstname:Consejo Superior de Investigaciones Científicas (CSIC)Inglés#PLACEHOLDER_PARENT_METADATA_VALUE##PLACEHOLDER_PARENT_METADATA_VALUE##PLACEHOLDER_PARENT_METADATA_VALUE#info:eu-repo/grantAgreement/AEI/Plan Estatal de Investigación Científica y Técnica y de Innovación 2021-2023/PID2021-123968NB-I00info:eu-repo/grantAgreement/AEI/Plan Estatal de Investigación Científica y Técnica y de Innovación 2017-2020/RTI2018-095076-B-C21info:eu-repo/grantAgreement/AEI/Plan Estatal de Investigación Científica y Técnica y de Innovación 2021-2023/CEX2019-000918-MThe underlying dataset has been published as supplementary material of the article in the publisher platform at DOI 10.1093/mnras/stad303https://doi.org/https://doi.org/10.1093/mnras/stad303Noinfo:eu-repo/semantics/openAccessoai:digital.csic.es:10261/3366652026-05-22T06:33:51Z
dc.title.none.fl_str_mv Formation of asymmetric arms in barred galaxies
title Formation of asymmetric arms in barred galaxies
spellingShingle Formation of asymmetric arms in barred galaxies
Sánchez-Martín, P.
Galaxies: kinematics and dynamics
Galaxies: structure
Galaxies: spiral
title_short Formation of asymmetric arms in barred galaxies
title_full Formation of asymmetric arms in barred galaxies
title_fullStr Formation of asymmetric arms in barred galaxies
title_full_unstemmed Formation of asymmetric arms in barred galaxies
title_sort Formation of asymmetric arms in barred galaxies
dc.creator.none.fl_str_mv Sánchez-Martín, P.
García-Gómez, C.
Masdemont, Josep J.
Romero-Gómez, Mercè
author Sánchez-Martín, P.
author_facet Sánchez-Martín, P.
García-Gómez, C.
Masdemont, Josep J.
Romero-Gómez, Mercè
author_role author
author2 García-Gómez, C.
Masdemont, Josep J.
Romero-Gómez, Mercè
author2_role author
author
author
dc.contributor.none.fl_str_mv Ministerio de Ciencia, Innovación y Universidades (España)
Agencia Estatal de Investigación (España)
European Commission
Generalitat de Catalunya
Alfred P. Sloan Foundation
Department of Energy (US)
dc.subject.none.fl_str_mv Galaxies: kinematics and dynamics
Galaxies: structure
Galaxies: spiral
topic Galaxies: kinematics and dynamics
Galaxies: structure
Galaxies: spiral
description We establish a dynamical mechanism to explain the origin of the asymmetry between the arms observed in some barred disc galaxies, where one of the two arms emanating from the bar ends is very well defined, while the second one displays a ragged structure, extending between its ridge and the bar. To this purpose, we study the invariant manifolds associated with the Lyapunov periodic orbits around the unstable equilibrium points at the ends of the bar. Matter from the galaxy centre is transported along these manifolds to the periphery, forming this way the spiral arms that emanate from the bar ends. If the mass distribution in the galaxy centre is not homogeneous, because of an asymmetric bar with one side stronger than the other, or because of a non-centred bulge, the dynamics about the two unstable Lagrange points at the ends of the bar will not be symmetric as well. One of their invariant manifolds becomes more extended than the other, enclosing a smaller section and the escaping orbits on it are fewer and dispersed in a wider region. The result is a weaker arm and more ragged than the one at the other end of the bar.
publishDate 2023
dc.date.none.fl_str_mv 2023
2023
2023
dc.type.none.fl_str_mv info:eu-repo/semantics/article
http://purl.org/coar/resource_type/c_6501
Publisher's version
info:eu-repo/semantics/publishedVersion
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv http://hdl.handle.net/10261/336665
url http://hdl.handle.net/10261/336665
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv #PLACEHOLDER_PARENT_METADATA_VALUE#
#PLACEHOLDER_PARENT_METADATA_VALUE#
#PLACEHOLDER_PARENT_METADATA_VALUE#
info:eu-repo/grantAgreement/AEI/Plan Estatal de Investigación Científica y Técnica y de Innovación 2021-2023/PID2021-123968NB-I00
info:eu-repo/grantAgreement/AEI/Plan Estatal de Investigación Científica y Técnica y de Innovación 2017-2020/RTI2018-095076-B-C21
info:eu-repo/grantAgreement/AEI/Plan Estatal de Investigación Científica y Técnica y de Innovación 2021-2023/CEX2019-000918-M
The underlying dataset has been published as supplementary material of the article in the publisher platform at DOI 10.1093/mnras/stad303
https://doi.org/https://doi.org/10.1093/mnras/stad303
No
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv Oxford University Press
publisher.none.fl_str_mv Oxford University Press
dc.source.none.fl_str_mv reponame:DIGITAL.CSIC. Repositorio Institucional del CSIC
instname:Consejo Superior de Investigaciones Científicas (CSIC)
instname_str Consejo Superior de Investigaciones Científicas (CSIC)
reponame_str DIGITAL.CSIC. Repositorio Institucional del CSIC
collection DIGITAL.CSIC. Repositorio Institucional del CSIC
repository.name.fl_str_mv
repository.mail.fl_str_mv
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