Frame-dragging and the kinematics of Galactic-Center stars

Details Frame-dragging and the kinematics of Galactic-Center stars Frame-dragging and the kinematics of Galactic-Center stars

2008-09-10

arxiv.org/abs/0809.1866v1

Astrophys.J.690:1553-1557,2009

Astronomy and Astrophysics

Astrophysics

To appear in ApJ

Scientific paper

10.1088/0004-637X/690/2/1553

We calculate the effects of frame dragging on the Galactic-Center stars. Assuming the stars are only slightly relativistic, we derive an approximation to the Kerr metric, which turns out to be a weak field Schwarzschild metric plus a frame dragging term. By numerically integrating the resulting geodesic equations, we compute the effect on keplerian elements and the kinematics. We find that the kinematic effect at pericenter passage is proportional to (a(1-e^2))^{-2}. For known Galactic-center stars it is of order 10 m/s. If observed this would provide a measurement of the spin of the black hole.

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