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Galactic disk structure as revealed by LAMOST A stars

  • B.-Q. Chen (a1) (a2), X.-W. Liu (a1), H.-B. Yuan (a3), Y. Huang (a1) (a2), M.-S. Xiang (a4) (a2), C. Wang (a1), Z.-J. Tian (a1) (a2) and H.-W. Zhang (a1)...

Abstract

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.

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Chen, B.-Q., et al. 2017, MNRAS, 464, 2545
Gaia Collaboration, Prusti, T., de Bruijne, J. H. J., et al. 2016, A&A, 595, A1
Liu, X.-W., et al. 2014, in IAU Symposium, Vol. 298, IAU Symposium, ed. Feltzing, S., Zhao, G., Walton, N. A., & Whitelock, P., 310–321
Sun, N.-C., et al. 2015, Research in Astronomy and Astrophysics, 15, 1342
Xiang, M.-S., et al. 2017a, MNRAS, 464, 3657
Xiang, M.-S., et al. 2017b, MNRAS, 467, 1890
Yuan, H.-B., et al. 2015, MNRAS, 448, 855
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Proceedings of the International Astronomical Union
  • ISSN: 1743-9213
  • EISSN: 1743-9221
  • URL: /core/journals/proceedings-of-the-international-astronomical-union
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