A New Method for Determining the Milky Way Bar Pattern Speed

Details A New Method for Determining the Milky Way Bar Pattern Speed A New Method for Determining the Milky Way Bar Pattern Speed

2010-02-09

arxiv.org/abs/1002.1742v1

Astronomy and Astrophysics

Astrophysics

Galaxy Astrophysics

6 pages, 2 figures. To appear in "Tumbling, twisting, and winding galaxies: Pattern speeds along the Hubble sequence", E. M. C

Scientific paper

Previous work has related the Galactic bar to structure in the local stellar velocity distribution. Here we show that the bar also influences the spatial gradients of the velocity vector via the Oort constants. By numerical integration of test-particles we simulate measurements of the Oort C value in a gravitational potential including the Galactic bar. We account for the observed trend that C is increasingly negative for stars with higher velocity dispersion. By comparing measurements of C with our simulations we improve on previous models of the bar, estimating that the bar pattern speed is Omega_b/Omega_0=1.87\pm0.04, where Omega_0 is the local circular frequency, and the bar angle lies within 20[deg]

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