Lopsidedness of Self-consistent Galaxies Caused by the External Field Effect of Clusters
Wu,Xufen1,2,3; Wang,Yougang4; Feix,Martin5,6; Zhao,HongSheng3,4
Source PublicationThe Astrophysical Journal
AbstractAbstract 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.
Keywordgalaxies: elliptical and lenticular, cD galaxies: kinematics and dynamics gravitation methods: numerical
WOS IDIOP:0004-637X-844-2-aa7b8a
PublisherThe American Astronomical Society
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Document Type期刊论文
Affiliation1.CAS Key Laboratory for Research in Galaxies and Cosmology, Department of Astronomy, University of Science and Technology of China, Hefei, 230026, P.R. China;
2.School of Astronomy and Space Science, University of Science and Technology of China, Hefei 230026, P.R. China
3.School of Physics and Astronomy, University of St Andrews, North Haugh, Fife, KY16 9SS, UK
4.Key Laboratory of Computational Astrophysics, National Astronomical Observatories, Chinese Academy of Sciences, Beijing, 100012, P.R. China
5.CNRS, UMR 7095 & UPMC, Institut d’Astrophysique de Paris, 98 bis Boulevard Arago, F-75014 Paris, France
6.Department of Physics, Israel Institute of Technology—Technion, Haifa 32000, Israel
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GB/T 7714
Wu,Xufen,Wang,Yougang,Feix,Martin,et al. Lopsidedness of Self-consistent Galaxies Caused by the External Field Effect of Clusters[J]. The Astrophysical Journal,2017,844(2).
APA Wu,Xufen,Wang,Yougang,Feix,Martin,&Zhao,HongSheng.(2017).Lopsidedness of Self-consistent Galaxies Caused by the External Field Effect of Clusters.The Astrophysical Journal,844(2).
MLA Wu,Xufen,et al."Lopsidedness of Self-consistent Galaxies Caused by the External Field Effect of Clusters".The Astrophysical Journal 844.2(2017).
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