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Exploring the Perturbed Milky Way Disk and the Substructures of the Outer Disk
Xu,Y.1; Liu,C.2; Tian,H.2; Newberg,H. J.3; Laporte,C. F. P.4,5; Zhang,B.6; Wang,H. F.7; Fu,X.8; Li,J.9,10; Deng,L. C.1
2020-12-01
Source PublicationThe Astrophysical Journal
ISSN0004-637X
Volume905Issue:1
AbstractAbstract The recent discovery of a spiral feature in the Z???V Z phase plane in the solar neighborhood implies that the galactic disk has been remarkably affected by a dwarf galaxy passing through it some hundreds of millions of years ago. Using 429,500 Large Sky Area Multi-Object Fibre Spectroscopic Telescope K giants stars, we show that the spiral feature exists not only in the solar vicinity but it also extends to about 15 kpc from the Galactic center and then disappears beyond this radius. Moreover, we find that when the spiral features in a plot of V ? as a function of position in the Z???V Z plane at various galactocentric radii are remapped to the R ??Z plane, the spiral can explain well the observed asymmetric velocity substructures. This is evidence that the phase spiral features are the same as the bulk motions found in previous work as well as this work. Test particle simulations and N-body simulations show that an encounter with a dwarf galaxy a few hundred million years ago will induce a perturbation in the galactic disk. In addition, we find that the last impact of Sgr dSph can also contribute to the flare. As a consequence of the encounter, the distribution function of disk stars at a large range of radii is imprinted by the gravitational perturbation.
KeywordMilky Way disk
DOI10.3847/1538-4357/abc2cb
Language英语
WOS IDIOP:0004-637X-905-1-abc2cb
PublisherThe American Astronomical Society
Citation statistics
Document Type期刊论文
Identifierhttp://ir.bao.ac.cn/handle/114a11/57794
Collection中国科学院国家天文台
Affiliation1.CAS Key Laboratory of Optical Astronomy, National Astronomical Observatories, Chinese Academy of Sciences, Beijing, 100101, People’s Republic of China xuyan@nao.cas.cn
2.Key Laboratory of Space Astronomy and Technology, National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100101, People’s Republic of China; liuchao@nao.cas.cn
3.Department of Physics, Applied Physics and Astronomy, Rensselaer Polytechnic Institute, Troy, NY 12180, USA
4.Department of Physics & Astronomy, University of Victoria, 3800 Finnerty Road, Victoria, BC V8P 5C2, Canada
5.Kavli Institute for the Physics and Mathematics of the Universe (WPI), The University of Tokyo Institutes for Advanced Study (UTIAS), The University of Tokyo, Chiba 277-8583, Japan
6.Department of Astronomy, Beijing Normal University, Beijing 100875, People's Republic of China, LAMOST Fellow
7.South?Western Institute for Astronomy Research, Yunnan University, Kunming, 650500, People’s Republic of China, LAMOST Fellow
8.KIAA-The Kavli Institute for Astronomy and Astrophysics at Peking University, Beijing 100871, People’s Republic of China
9.Physics and Space Science College, China West Normal University, 1 ShiDa Road, Nanchong 637002 , People’s Republic of China
10.SHAO, Chinese Academy of Sciences, Nandan Road, Shanghai 200030; People’s Republic of China, LAMOST Fellow
First Author AffilicationNational Astronomical Observatories, Chinese Academy of Sciences
Recommended Citation
GB/T 7714
Xu,Y.,Liu,C.,Tian,H.,et al. Exploring the Perturbed Milky Way Disk and the Substructures of the Outer Disk[J]. The Astrophysical Journal,2020,905(1).
APA Xu,Y..,Liu,C..,Tian,H..,Newberg,H. J..,Laporte,C. F. P..,...&Deng,L. C..(2020).Exploring the Perturbed Milky Way Disk and the Substructures of the Outer Disk.The Astrophysical Journal,905(1).
MLA Xu,Y.,et al."Exploring the Perturbed Milky Way Disk and the Substructures of the Outer Disk".The Astrophysical Journal 905.1(2020).
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