Academic Journal
Formation of asymmetric arms in barred galaxies
| العنوان: | Formation of asymmetric arms in barred galaxies |
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| المؤلفون: | Sánchez Martín, Patricia, García Gómez, Carles, Masdemont Soler, Josep, Romero Gómez, Merce |
| المساهمون: | Universitat Politècnica de Catalunya. Departament de Matemàtiques, Universitat Politècnica de Catalunya. UPCDS - Grup de Sistemes Dinàmics de la UPC |
| بيانات النشر: | Oxford University Press |
| سنة النشر: | 2023 |
| المجموعة: | Universitat Politècnica de Catalunya, BarcelonaTech: UPCommons - Global access to UPC knowledge |
| مصطلحات موضوعية: | Àrees temàtiques de la UPC::Matemàtiques i estadística, Stellar dynamics, Galactic dynamics, Galaxies, Galaxies: kinematics and dynamics, Galaxies: structure, Galaxies: spiral, Dinàmica estel·lar, Dinàmica galàctica, Galàxies |
| الوصف: | 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. ; 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 Reviewed ; Preprint |
| نوع الوثيقة: | article in journal/newspaper |
| وصف الملف: | 7 p.; application/pdf |
| اللغة: | English |
| تدمد: | 1365-2966 |
| Relation: | https://academic.oup.com/mnras/article-abstract/520/3/3909/7008506; info:eu-repo/grantAgreement/AEI/Plan Estatal de Investigación Científica y Técnica y de Innovación (PEICTI) 2017-2020/PID2021-123968NB-I00/ES/MÉTODOS MODERNOS EN MECÁNICA CELESTE Y APLICACIONES/; Sanchez, P. [et al.]. Formation of asymmetric arms in barred galaxies. "Monthly notices of the Royal Astronomical Society", 1 Abril 2023, vol. 520, núm. 3, p. 3909-3915.; http://hdl.handle.net/2117/399161 |
| DOI: | 10.1093/mnras/stad303 |
| الاتاحة: | http://hdl.handle.net/2117/399161 https://doi.org/10.1093/mnras/stad303 |
| Rights: | Open Access |
| رقم الانضمام: | edsbas.84512192 |
| قاعدة البيانات: | BASE |
| تدمد: | 13652966 |
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| DOI: | 10.1093/mnras/stad303 |