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- W2948564501 abstract "We use the continuity equation to derive a method for measuring the pattern speed of the Milky Way's bar/bulge from proper motion data. The method has minimal assumptions but requires complete coverage of the non-axisymmetric component in two of the three Galactic coordinates. We apply our method to the proper motion data from a combination of Gaia DR2 and VISTA Variables in the Via Lactea (VVV) to measure the pattern speed of the bar as $Omega_mathrm{p}=(41pm 3),mathrm{km,s^{-1},kpc^{-1}}$ (where the error is statistical). This puts the corotation radius at $(5.7pm0.4),mathrm{kpc}$, under the assumptions of the standard peculiar motion of the Sun and the absence of non-axisymmetric streaming in the Solar neighbourhood. The obtained result uses only data on the near-side of the bar which produces consistent measurements of the distance and velocity of the centre of the Galaxy. Addition of the data on the far-side of the bar pulls the pattern speed down to $Omega_mathrm{p}=(31pm 1),mathrm{km,s^{-1},kpc^{-1}}$ but requires a lower transverse velocity for the Galactic centre than observed. This suggests systematics of $5-10,mathrm{km,s^{-1}kpc^{-1}}$ dominate the uncertainty. We demonstrate using a dynamically-formed bar/bulge simulation that even with the limited field of view of the VVV survey our method robustly recovers the pattern speed." @default.
- W2948564501 created "2019-06-14" @default.
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- W2948564501 date "2019-07-17" @default.
- W2948564501 modified "2023-10-10" @default.
- W2948564501 title "The pattern speed of the Milky Way bar from transverse velocities" @default.
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- W2948564501 doi "https://doi.org/10.1093/mnras/stz1827" @default.
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