Resonant relaxation and the warp of the stellar disc in the Galactic centre

Details Resonant relaxation and the warp of the stellar disc in the Galactic centre Resonant relaxation and the warp of the stellar disc in the Galactic centre

2010-05-31

arxiv.org/abs/1006.0001v2

Monthly Notices of the Royal Astronomical Society, Volume 412, Issue 1, pp. 187-207

Astronomy and Astrophysics

Astrophysics

Galaxy Astrophysics

24 pages, 8 figures, accepted by MNRAS

Scientific paper

10.1111/j.1365-2966.2010.17897.x

Observations of the spatial distribution and kinematics of young stars in the Galactic centre can be interpreted as showing that the stars occupy one, or possibly two, discs of radii ~0.05-0.5 pc. The most prominent (`clockwise') disc exhibits a strong warp: the normals to the mean orbital planes in the inner and outer third of the disc differ by ~60 deg. Using an analytical model based on Laplace-Lagrange theory, we show that such warps arise naturally and inevitably through vector resonant relaxation between the disc and the surrounding old stellar cluster.

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