Constraints on the Galactic bar with RAVE

摘要

We derive the pattern speed of the Galactic bar from the analysis-of the kinematics of the Hercules stream at different Galactocentric radii with RAVE, assuming that Hercules is caused by the bar. We find a well constrained pattern speed of Ωb = 1.98{formula}Ω_0, where Ω_0 is the local circular frequency.