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Mapping the Galactic Disk with the LAMOST and Gaia Red Clump Sample. III. A New Velocity Substructure and Time Stamps of the Galactic Disk Asymmetry in the Disk between 12 and 15 kpc
Wang,Hai-Feng1,2; Carlin,Jeffrey L.3; Huang,Y.1; López-Corredoira,Martíin4,5; Chen,B.-Q.1; Wang,C.6,7; Chang,J.8,9; Zhang,H.-W.6,7; Xiang,M.-S.8,10; Yuan,H.-B.11; Sun,W.-X.1; Li,X.-Y.1; Yang,Y.1; Deng,L.-C.2,8
2019-10-18
Source PublicationThe Astrophysical Journal
ISSN0004-637X
Volume884Issue:2
AbstractAbstract We investigate the three-dimensional asymmetrical kinematics and present time stamps of the Milky Way disk between Galactocentric distances of R?=?12 and 15 kpc, using red clump stars selected from the LAMOST Galactic survey, also with proper motion measurements provided by the Gaia DR2. We discover velocity substructure above the Galactic plane corresponding to a density dip found recently (“South-middle opposite” density structure [R?~?12–15 kpc, Z?~?1.5 kpc] discovered in Wang et al.) in the radial and azimuthal velocity. For the vertical velocity, we detect clear vertical bulk motions or bending mode motions, which has no clear North–South asymmetry corresponding to the in-plane asymmetrical features. In the subsample of stars with different ages, we find that there is little temporal evolution of the in-plane asymmetry from 0 to 14 Gyr, which means the structure is possibly sensitive to the perturbations in almost cosmic time. We propose that the possible scenario of this asymmetric velocity structure is caused by the mechanisms generated in-plane, rather than vertical perturbations.
KeywordGalaxy: disk Galaxy: kinematics and dynamics Galaxy: structure
DOI10.3847/1538-4357/ab4204
Language英语
WOS IDIOP:0004-637X-884-2-ab4204
PublisherThe American Astronomical Society
Citation statistics
Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/28327
Collection中国科学院紫金山天文台
Affiliation1.South–Western Institute for Astronomy Research, Yunnan University, Kunming, 650500, People’s Republic of China; hfwang@bao.ac.cn, yanghuang@pku.edu.cn
2.Department of Astronomy, China West Normal University, Nanchong 637009, People’s Republic of China
3.LSST, 950 North Cherry Avenue, Tucson, AZ 85719, USA
4.Instituto de Astrofísica de Canarias, E-38205 La Laguna, Tenerife, Spain
5.Departamento de Astrofísica, Universidad de La Laguna, E-38206 La Laguna, Tenerife, Spain
6.Department of Astronomy, Peking University, Beijing 100871, People’s Republic of China
7.Kavli Institute for Astronomy and Astrophysics, Peking University, Beijing 100871, People’s Republic of China
8.Key Laboratory of Optical Astronomy, National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012, People’s Republic of China
9.Purple Mountain Observatory, the Partner Group of MPI für Astronomie, 2 West Beijing Road, Nanjing 210008, People’s Republic of China
10.Max-Planck Institute for Astronomy, Konigstuhl, D-69117, Heidelberg, Germany
11.Department of Astronomy, Beijing Normal University, Beijing 100875, People’s Republic of China
Recommended Citation
GB/T 7714
Wang,Hai-Feng,Carlin,Jeffrey L.,Huang,Y.,et al. Mapping the Galactic Disk with the LAMOST and Gaia Red Clump Sample. III. A New Velocity Substructure and Time Stamps of the Galactic Disk Asymmetry in the Disk between 12 and 15 kpc[J]. The Astrophysical Journal,2019,884(2).
APA Wang,Hai-Feng.,Carlin,Jeffrey L..,Huang,Y..,López-Corredoira,Martíin.,Chen,B.-Q..,...&Deng,L.-C..(2019).Mapping the Galactic Disk with the LAMOST and Gaia Red Clump Sample. III. A New Velocity Substructure and Time Stamps of the Galactic Disk Asymmetry in the Disk between 12 and 15 kpc.The Astrophysical Journal,884(2).
MLA Wang,Hai-Feng,et al."Mapping the Galactic Disk with the LAMOST and Gaia Red Clump Sample. III. A New Velocity Substructure and Time Stamps of the Galactic Disk Asymmetry in the Disk between 12 and 15 kpc".The Astrophysical Journal 884.2(2019).
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