From manifolds to Lagrangian coherent structures in galactic bar models
被引:4
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作者:
Sanchez-Martin, P.
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机构:
Univ Ramon Llull, GTM Grp Recerca Tecnol Media, Quatre Camins 2, Barcelona 08022, SpainUniv Ramon Llull, GTM Grp Recerca Tecnol Media, Quatre Camins 2, Barcelona 08022, Spain
galaxies: kinematics and dynamics;
galaxies: spiral;
galaxies: structure;
RESTRICTED 3-BODY PROBLEM;
3-DIMENSIONAL BARS;
ORBITAL DYNAMICS;
BUILDING-BLOCKS;
GLOBAL DYNAMICS;
GALAXIES;
SYSTEMS;
FLOWS;
CHAOS;
RINGS;
D O I:
10.1051/0004-6361/201833451
中图分类号:
P1 [天文学];
学科分类号:
0704 ;
摘要:
We 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.
机构:
KTH Royal Inst Technol, Dept Sustainable Dev Environm Sci & Engn, Div Hydraul Engn, Stockholm, SwedenKTH Royal Inst Technol, Dept Sustainable Dev Environm Sci & Engn, Div Hydraul Engn, Stockholm, Sweden
机构:
Univ Santiago de Compostela, Grp Nonlinear Phys, Santiago De Compostela 15782, SpainUniv Santiago de Compostela, Grp Nonlinear Phys, Santiago De Compostela 15782, Spain
Garaboa-Paz, Daniel
Eiras-Barca, Jorge
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机构:
Univ Santiago de Compostela, Grp Nonlinear Phys, Santiago De Compostela 15782, SpainUniv Santiago de Compostela, Grp Nonlinear Phys, Santiago De Compostela 15782, Spain
Eiras-Barca, Jorge
Huhn, Florian
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机构:
Swiss Fed Inst Technol, Dept Mech & Proc Engn, Inst Mech Syst, CH-8092 Zurich, SwitzerlandUniv Santiago de Compostela, Grp Nonlinear Phys, Santiago De Compostela 15782, Spain
Huhn, Florian
Perez-Munuzuri, Vicente
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机构:
Univ Santiago de Compostela, Grp Nonlinear Phys, Santiago De Compostela 15782, SpainUniv Santiago de Compostela, Grp Nonlinear Phys, Santiago De Compostela 15782, Spain
机构:
State Key Laboratory of Marine Environmental Science, College of Ocean and Earth Sciences, Xiamen UniversityState Key Laboratory of Marine Environmental Science, College of Ocean and Earth Sciences, Xiamen University
Zhehao Zheng
Wei Zhuang
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机构:
State Key Laboratory of Marine Environmental Science, College of Ocean and Earth Sciences, Xiamen University
Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai)State Key Laboratory of Marine Environmental Science, College of Ocean and Earth Sciences, Xiamen University
Wei Zhuang
Jianyu Hu
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机构:
State Key Laboratory of Marine Environmental Science, College of Ocean and Earth Sciences, Xiamen University
Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai)State Key Laboratory of Marine Environmental Science, College of Ocean and Earth Sciences, Xiamen University
Jianyu Hu
Zelun Wu
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机构:
State Key Laboratory of Marine Environmental Science, College of Ocean and Earth Sciences, Xiamen University
Joint Center for Ocean Remote Sensing, University of Delaware-Xiamen UniversityState Key Laboratory of Marine Environmental Science, College of Ocean and Earth Sciences, Xiamen University
Zelun Wu
Changjian Liu
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机构:
South China Sea Marine Survey and Technology Center, Ministry of Natural ResourcesState Key Laboratory of Marine Environmental Science, College of Ocean and Earth Sciences, Xiamen University