Differential rotation of the halo traced by the K-giant stars

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. Modelling the rotational velocity distribution with both the halo and disk components, we find that the rotational velocity of the halo population decreases almost linearly with increasing vertical distance to the galactic disk plane, $Z$, at fixed galactocentric radius, $R$. The samples are separated into two parts with $6

Keywords:

• Astrophysics
• Galactic halo
• Stars
• Physics
• Disc
• Thick disk
• Differential rotation
• Astronomy
• Giant star
• Population
• Halo

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