volume 13, issue S334, P109-115 2017
DOI: 10.1017/s1743921317010870
View full text
Chao Liu, Yan Xu, Haifeng Wang, Junchen Wan

Abstract: From the derived stellar density profile using LAMOST giant stars, we find that the Galactic disk does not show truncation or break, but smoothly transit to the halo from 19 kpc. The scale length of the outer disk is only 1.6 ± 0.1 kpc, substantially smaller than previous results. This implies that the shapes of the inner and outer disk are different. Meanwhile, the disk flaring is not only found in older populations, but also in younger population. Moreover, the vertical oscillations of the disk are identifi…

expand abstract