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Tracing the rotational velocity of the halo with K-giant stars in LAMOST-Gaia era

Published online by Cambridge University Press:  14 May 2020

Hao Tian Open the ORCID record for Hao Tian [Opens in a new window] ,
Chao Liu Open the ORCID record for Chao Liu [Opens in a new window] ,
Yan Xu  and
Xiang-Xiang Xue
Hao Tian
Affiliation:
Key Laboratory of Optical Astronomy, National Astronomical Observatories, Chinese Academy of Sciences, Datun Road 20A, Beijing100101, PR China
Chao Liu
Affiliation:
Key Laboratory of Optical Astronomy, National Astronomical Observatories, Chinese Academy of Sciences, Datun Road 20A, Beijing100101, PR China
Yan Xu
Affiliation:
Key Laboratory of Optical Astronomy, National Astronomical Observatories, Chinese Academy of Sciences, Datun Road 20A, Beijing100101, PR China
Xiang-Xiang Xue
Affiliation:
Key Laboratory of Optical Astronomy, National Astronomical Observatories, Chinese Academy of Sciences, Datun Road 20A, Beijing100101, PR China
Rights & Permissions [Opens in a new window]

Abstract

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LAMOST has obtained a large number of spectra for K-giant stars whose metallicities are well measured and released in DR5. Combining with the distances, radial velocities and proper motions provided by Gaia DR2, the full position and velocity information has been obtained. Using the Bayesian method we have constrained the rotational velocity of the halo and thick disk components in the local volume within 4 kpc from the Sun. The values of the rotational velocity are and for the halo and disk respectively, with the velocity of LSR assumed to be 232 km s−1. The dispersions of the rotational velocity are and for the two components. What’s more, another hot retrogradely rotating component is discovered.

Keywords

HalokinematicsMilky Way
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 14 , Symposium S353: Galactic Dynamics in the Era of Large Surveys , June 2019 , pp. 57 - 58
Copyright
© International Astronomical Union 2020

Footnotes

†

LAMOST FELLOW

References

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