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Frame-dragging and the kinematics of galactic-center stars


Kannan, R; Saha, P (2009). Frame-dragging and the kinematics of galactic-center stars. Astrophysical Journal, 690(2):1553-1557.

Abstract

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–1. If observed, this would provide a measurement of the spin of the black hole.

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–1. If observed, this would provide a measurement of the spin of the black hole.

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12 citations in Web of Science®
10 citations in Scopus®
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Additional indexing

Item Type:Journal Article, refereed, original work
Communities & Collections:07 Faculty of Science > Institute for Computational Science
Dewey Decimal Classification:530 Physics
Language:English
Date:January 2009
Deposited On:25 Feb 2010 16:48
Last Modified:05 Apr 2016 13:56
Publisher:Institute of Physics Publishing
ISSN:0004-637X
Publisher DOI:https://doi.org/10.1088/0004-637X/690/2/1553
Related URLs:http://arxiv.org/abs/0809.1866
Permanent URL: https://doi.org/10.5167/uzh-30897

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