FRAME DRAGGING AND THE KINEMATICS OF GALACTIC-CENTER STARS

被引：22

作者：

Kannan, Rahul ^{[1
,2
]}

Saha, Prasenjit ^{[2
]}

机构：

[1] Indian Inst Technol, Dept Phys, Kharagpur 721302, W Bengal, India

[2] Univ Zurich, Inst Theoret Phys, CH-8057 Zurich, Switzerland

来源：

ASTROPHYSICAL JOURNAL | 2009年 / 690卷 / 02期

关键词：

Galaxy: nucleus; relativity; stellar dynamics; BLACK-HOLE; STELLAR DYNAMICS; ORBITS;

D O I：

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

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

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.

引用

页码：1553 / 1557

页数：5

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