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Lopsidedness of Self-consistent Galaxies Caused by the External Field Effect of

文献类型：期刊论文

作者Zhao, HongSheng2,3; Wu, Xufen1,2,7; Wang, Yougang3; Feix, Martin4,5,6
刊名ASTROPHYSICAL JOURNAL
出版日期2017-08-01
卷号844期号:2
关键词Galaxies: Kinematics And Dynamics Galaxies: Elliptical And Lenticular Gravitation Cd Methods:Numerical
DOI10.3847/1538-4357/aa7b8a
文献子类Article
英文摘要Adopting Schwarzschild's orbit-superposition technique, we construct a series of self-consistent galaxy models, embedded in the external field of galaxy clusters in the framework of Milgrom's MOdified Newtonian Dynamics (MOND). These models represent relatively massive ellipticals with a Hernquist radial profile at various distances from the cluster center. Using N-body simulations, we perform a first analysis of these models and their evolution. We find that self-gravitating axisymmetric density models, even under a weak external field, lose their symmetry by instability and generally evolve to triaxial configurations. A kinematic analysis suggests that the instability originates from both box and nonclassified orbits with low angular momentum. We also consider a self-consistent isolated system that is then placed in a strong external field and allowed to evolve freely. This model, just like the corresponding equilibrium model in the same external field, eventually settles to a triaxial equilibrium as well, but has a higher velocity radial anisotropy and is rounder. The presence of an external field in the MOND universe generically predicts some lopsidedness of galaxy shapes.
WOS关键词MODIFIED NEWTONIAN DYNAMICS ; RADIAL-ORBIT INSTABILITY ; DWARF ELLIPTIC GALAXIES ; N-BODY SIMULATIONS ; DARK-MATTER HALOS ; OFF-CENTER NUCLEI ; STELLAR-SYSTEMS ; TRIAXIAL GALAXIES ; MILKY-WAY ; SPIRAL GALAXIES
WOS研究方向Astronomy & Astrophysics
语种英语
WOS记录号WOS:000406652900008
资助机构NSFC(11503025 ; NSFC(11503025 ; Fundamental Research Funds for the Central Universities ; Fundamental Research Funds for the Central Universities ; European Community-Research Infrastructure Action under the FP8 "Structuring the European Research Area" program(211437) ; European Community-Research Infrastructure Action under the FP8 "Structuring the European Research Area" program(211437) ; Hundred Talents Project of Anhui Province ; Hundred Talents Project of Anhui Province ; Scottish Universities Physics Alliance (SUPA) ; Scottish Universities Physics Alliance (SUPA) ; 973 Program(2014CB845703) ; 973 Program(2014CB845703) ; I-CORE Program of the Planning and Budgeting Committee ; I-CORE Program of the Planning and Budgeting Committee ; Israel Science Foundation(1829/12 ; Israel Science Foundation(1829/12 ; Asher Space Research Institute ; Asher Space Research Institute ; Minerva Foundation ; Minerva Foundation ; 11421303 ; 11421303 ; 203/09) ; 203/09) ; 11390372 ; 11390372 ; 1163004) ; 1163004) ; NSFC(11503025 ; NSFC(11503025 ; Fundamental Research Funds for the Central Universities ; Fundamental Research Funds for the Central Universities ; European Community-Research Infrastructure Action under the FP8 "Structuring the European Research Area" program(211437) ; European Community-Research Infrastructure Action under the FP8 "Structuring the European Research Area" program(211437) ; Hundred Talents Project of Anhui Province ; Hundred Talents Project of Anhui Province ; Scottish Universities Physics Alliance (SUPA) ; Scottish Universities Physics Alliance (SUPA) ; 973 Program(2014CB845703) ; 973 Program(2014CB845703) ; I-CORE Program of the Planning and Budgeting Committee ; I-CORE Program of the Planning and Budgeting Committee ; Israel Science Foundation(1829/12 ; Israel Science Foundation(1829/12 ; Asher Space Research Institute ; Asher Space Research Institute ; Minerva Foundation ; Minerva Foundation ; 11421303 ; 11421303 ; 203/09) ; 203/09) ; 11390372 ; 11390372 ; 1163004) ; 1163004)
源URL[http://ir.bao.ac.cn/handle/114a11/20078]  
专题国家天文台_光学天文研究部
作者单位1.Univ Sci & Technol China, Sch Astron & Space Sci, Hefei 230026, Peoples R China
2.Univ St Andrews, Sch Phys & Astron, North Haugh KY16 9SS, Fife, Scotland
3.Chinese Acad Sci, Key Lab Computat Astrophys, Natl Astron Observ, Beijing 100012, Peoples R China
4.CNRS, UMR 7095, 98 Bis Blvd Arago, F-75014 Paris, France
5.UPMC, Inst Astrophys Paris, 98 Bis Blvd Arago, F-75014 Paris, France
6.Israel Inst Technol Technion, Dept Phys, IL-32000 Haifa, Israel
7.Univ Sci & Technol China, Dept Astron, CAS Key Lab Res Galaxies & Cosmol, Hefei 230026, Peoples R China
推荐引用方式
GB/T 7714		 Zhao, HongSheng,Wu, Xufen,Wang, Yougang,et al. Lopsidedness of Self-consistent Galaxies Caused by the External Field Effect of[J]. ASTROPHYSICAL JOURNAL,2017,844(2).
APA Zhao, HongSheng,Wu, Xufen,Wang, Yougang,&Feix, Martin.(2017).Lopsidedness of Self-consistent Galaxies Caused by the External Field Effect of.ASTROPHYSICAL JOURNAL,844(2).
MLA Zhao, HongSheng,et al."Lopsidedness of Self-consistent Galaxies Caused by the External Field Effect of".ASTROPHYSICAL JOURNAL 844.2(2017).

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来源：国家天文台

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