The dynamics and structure of the Milky Way halo, such as the rotation curve of the Milky Way, the total mass and mass profile of the Milky Way, the stellar density profile and substructure in the Galactic stellar halo, etc…

We made the first-ever precise measurements on the Galactic rotation curve to 60 kpc and the mass of the Milky Way using the kinematics of halo stars drawn from SDSS survey.

Using SEGUE K giants, we first made a good measurement on the stellar density profile up to 80 kpc.

[1] The Milky Way's Circular Velocity Curve to 60 kpc and an Estimate of the Dark Matter Halo Mass from the Kinematics of ~2400 SDSS Blue Horizontal-Branch Stars; Xue, Xiang-Xiang; Rix, H.-W.; Zhao, G.; et al.;  ApJ, 2008, 684, 1143

[2] Quantifying Kinematic Substructure in the Milky Way's Stellar Halo; Xue, Xiang-Xiang; Rix, Hans-Walter; Yanny, Brian et al., ApJ, 2011, 738, 79

[3] The Radial Profile and Flattening of the Milky Way’s Stellar Halo to 80 kpc from the SEGUE K-giant Survey; Xue, Xiang-Xiang; Rix, Hans-Walter et al.; ApJ, 2015,809,144