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Galactic disk structure as revealed by LAMOST A stars

Published online by Cambridge University Press:  07 March 2018

B.-Q. Chen ,
X.-W. Liu ,
H.-B. Yuan ,
Y. Huang ,
M.-S. Xiang ,
C. Wang ,
Z.-J. Tian  and
H.-W. Zhang
B.-Q. Chen
Affiliation:
Department of Astronomy, Peking University, Beijing 100871, P.R.China email: [email protected] LAMOST fellow
X.-W. Liu
Affiliation:
Department of Astronomy, Peking University, Beijing 100871, P.R.China email: [email protected]
H.-B. Yuan
Affiliation:
Department of Astronomy, Beijing Normal University, Beijing100875, P.R.China
Y. Huang
Affiliation:
Department of Astronomy, Peking University, Beijing 100871, P.R.China email: [email protected] LAMOST fellow
M.-S. Xiang
Affiliation:
National Astronomy Observatories, Chinese Academy of Sciences, Beijing100012, P.R.China LAMOST fellow
C. Wang
Affiliation:
Department of Astronomy, Peking University, Beijing 100871, P.R.China email: [email protected]
Z.-J. Tian
Affiliation:
Department of Astronomy, Peking University, Beijing 100871, P.R.China email: [email protected] LAMOST fellow
H.-W. Zhang
Affiliation:
Department of Astronomy, Peking University, Beijing 100871, P.R.China email: [email protected]
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Abstract

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Using the spectroscopic distances of over 0.12 million A-type stars selected from the LAMOST Spectroscopic Survey of the Galactic Anti-center (LSS-GAC), we map their three-dimensional number density distributions in the Galaxy. These stellar number density maps allow an investigation of the Galactic young age thin disk structure with no a priori assumptions about the functional form of its components. The data show strong evidence for a significant flaring young disk. A more detail analysis show that the stellar flaring have different behaviours between the Northern and the Southern Galactic disks. The maps also reveal spatially coherent, kpc-scale stellar substructure in the thin disk. Finally, we detect the Perseus arm stellar overdensity at R ~ 10 kpc.

Keywords

Galaxy: diskGalaxy: structure
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 12 , Symposium S330: Astrometry and Astrophysics in the Gaia sky , April 2017 , pp. 208 - 209
Copyright
Copyright © International Astronomical Union 2018 

References

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