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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 

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