Differential Rotation of the Halo Traced by K-giant Stars

• Published in: The Astrophysical journal Vol. 899; no. 2; pp. 110 - 121
• Main Authors: Tian, Hao, Liu, Chao, Wang, Yougang, Xu, Yan, Yang, Chengqun, Zhang, Bo, Xue, Xiang-Xiang
• Format: Journal Article
• Language: English
• Published: Philadelphia The American Astronomical Society 01.08.2020; IOP Publishing
• Subjects: Astronomical models; Astrophysics; Computer simulation; Differential rotation; Enceladus; Galactic disk; Galactic halos; Giant stars; K giant stars; Milky Way disk; Milky Way dynamics; Milky Way evolution; Milky Way Galaxy; Milky Way rotation; Milky Way stellar halo; Velocity; Velocity distribution

We use K-giant stars selected from the LAMOST DR5 to study the variation of the rotational velocity of the Galactic halo at different space positions. Modeling the rotational velocity distribution with both the halo and disk components, we find that the rotational velocity of the halo population dec...