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The age-kinematical features in the Milky Way outer disk

Published online by Cambridge University Press:  21 March 2017

Chao Liu ,
Hai-Jun Tian  and
Jun-Chen Wan
Chao Liu
Affiliation:
Key Lab of Astronomy, National Astronomical Observatories, CAS, Beijing 100012, China email: [email protected]
Hai-Jun Tian
Affiliation:
China Three Gorges University, Yichang 443002, China
Jun-Chen Wan
Affiliation:
Key Lab of Astronomy, National Astronomical Observatories, CAS, Beijing 100012, China email: [email protected] University of China Academy of Sciences, Beijing 100049, China
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Abstract

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We derive the mean velocity components at various Galactocentric radii from 8 to 14 kpc using about 40,000 red clump stars observed in the LAMOST survey. We find that the vertical bulk motion for younger red clump stars are significantly larger than that for the older red clump stars. This is likely the kinematical feature of the Galactic warp around its line-of-node, which is located close to the Galactic anti-center region. It is evident that the warp are mainly contributed by the younger stars rather than the older stars. The age variation in the vertical kinematics favors a formation scenario where the Galactic warp is originated from infalling misaligned gas.

Keywords

Galaxy: kinematics and dynamicsGalaxy: structureGalaxy: diskGalaxy: evolution
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 11 , Symposium S321: Formation and Evolution of Galaxy Outskirts , March 2016 , pp. 6 - 9
Copyright
Copyright © International Astronomical Union 2017 

References

Carlin, J. L., et al. 2013, ApJL, 777, 5 CrossRefGoogle Scholar
Cui, X.-Q., et al. 2012, RAA, 12, 1197 Google Scholar
Debattista, V. P. & Sellwood, J. A. 1999, ApJL, 513, 107 CrossRefGoogle Scholar
Deng, L.-C., et al. 2012, RAA, 12, 735 Google Scholar
Drimmel, R., Smart, R. L., & Lattanzi, M. G. 2000, A&A, 354, 67 Google Scholar
Gómez, F. A., et al. 2013, MNRAS, 429, 159 CrossRefGoogle Scholar
Levine, E. S., Blitz, L., & Heiles, C. 2006, ApJ, 643, 881 CrossRefGoogle Scholar
Liu, X.-W., et al. 2014, IAU Symposium 298: Setting the scene for Gaia and LAMOST, Ed. Feltzing, S., Zhao, G., and Walton, N. A., 310 Google Scholar
López-Corredoira, M., et al. 2002, A&A, 394, 883 Google Scholar
López-Corredoira, M., et al. 2014, A&A, 572, 101 Google Scholar
Roškar, R., et al. 2010, MNRAS, 408, 783 CrossRefGoogle Scholar
Shen, J. & Sellwood, J. A. 2006, MNRAS, 370, 2 CrossRefGoogle Scholar
Tian, H.-J., et al. 2016, arXiv:1603.06262Google Scholar
Wan, J.-C., et al. 2015, Research in Astronomy and Astrophysics, 15, 1166 CrossRefGoogle Scholar
Williams, M. E. K., et al. 2013, MNRAS, 436, 101 CrossRefGoogle Scholar
Yao, S., et al. 2012, Research in Astronomy and Astrophysics, 12, 772 CrossRefGoogle Scholar
Zhao, G., et al. 2012, Research in Astronomy and Astrophysics, 12, 723 CrossRefGoogle Scholar