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We measure the Milky Way's rotation curve over the Galactocentric range 4 kpc 99% confidence. We find an offset between the Sun's rotational velocity and the local circular velocity of 26 +/- 3 km/s, which is larger than the locally-measured solar motion of 12 km/s. This larger offset reconciles our value for Vc with recent claims that Vc >~ 240 km/s. Combining our results with other data, we find that the Milky Way's dark-halo mass within the virial radius is ~8x10^11 Mₛun.
Bovy et al. (Mon,) studied this question.
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