Orbital classification in an N-body bar

	Orbital classification in an N-body bar
	Wang, Yougang1 ; Athanassoula, E.2; Mao, Shude1,3,4
刊名	MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
	2016-12-01
卷号	463 期号:4 页码:3499-3512
关键词	Galaxy: bulge galaxies: kinematics and dynamics galaxies: structure
英文摘要	The dynamics and evolution of any galactic structure are strongly influenced by the properties of the orbits that constitute it. In this paper, we compare two orbit classification schemes, one by Laskar [numerical analysis of fundamental frequencies (NAFF)], and the other by Carpintero and Aguilar (CA), by applying both of them to orbits obtained by following individual particles in a numerical simulation of a barred galaxy. We find that, at least for our case and some provisos, the main frequencies calculated by the two methods are in good agreement: for 80 per cent of the orbits the difference between the results of the two methods is less than 5 per cent for all three main frequencies. However, it is difficult to evaluate the amount of regular or chaotic bar orbits in a given system. The fraction of regular orbits obtained by the NAFF method strongly depends on the critical frequency drift parameter, while in the CA method the number of fundamental frequencies strongly depends on the frequency difference parameter L-r and the maximum integer used for searching the linear independence of the fundamental frequencies. We also find that, for a given particle, in general the projection of its motion along the bar minor axis is more regular than the other two projections, while the projection along the intermediate axis is the least regular.
WOS标题词	Science & Technology ; Physical Sciences
类目[WOS]	Astronomy & Astrophysics
研究领域[WOS]	Astronomy & Astrophysics
关键词[WOS]	SPECTRAL STELLAR DYNAMICS ; FREQUENCY MAP ANALYSIS ; GLOBAL DYNAMICS ; CHAOTIC MOTION ; HAMILTONIAN-SYSTEMS ; GALAXIES S(4)G ; SPITZER SURVEY ; GALACTIC BAR ; MODELS ; EVOLUTION
收录类别	SCI
语种	英语
WOS记录号	WOS:000393568200007
内容类型	期刊论文
源URL	[http://ir.bao.ac.cn/handle/114a11/8269]
专题	国家天文台_星系宇宙学研究部
作者单位	1.Chinese Acad Sci, Key Lab Computat Astrophys, Natl Astron Observ, Beijing 100012, Peoples R China 2.Aix Marseille Univ, CNRS, LAM, UMR 7326, F-13388 Marseille 13, France 3.Tsinghua Univ, Dept Phys, Ctr Astrophys, Beijing 100084, Peoples R China 4.Univ Manchester, Ctr Astrophys, Jodrell Bank, Manchester M13 9PL, Lancs, England
推荐引用方式 GB/T 7714	Wang, Yougang,Athanassoula, E.,Mao, Shude. Orbital classification in an N-body bar[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2016,463(4):3499-3512.
APA	Wang, Yougang,Athanassoula, E.,&Mao, Shude.(2016).Orbital classification in an N-body bar.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,463(4),3499-3512.
MLA	Wang, Yougang,et al."Orbital classification in an N-body bar".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 463.4(2016):3499-3512.