Non-linear resonance in nearly geodesic motion in low-mass X-ray binaries

被引:162
作者
Abramowicz, MA [1 ]
Karas, V
Kluzniak, W
Lee, WH
Rebusco, P
机构
[1] Chalmers Univ, Dept Astrophys, S-41296 Gothenburg, Sweden
[2] SISSA, I-34014 Trieste, Italy
[3] Charles Univ Prague, Inst Astron, CZ-18000 Prague, Czech Republic
[4] Zielona Gora Univ, Inst Astron, PL-65265 Zielona Gora, Poland
[5] CESR, F-31028 Toulouse 4, France
[6] Univ Nacl Autonoma Mexico, Astron Inst, Mexico City 04510, DF, Mexico
[7] Univ Trieste, Dept Phys, I-34127 Trieste, Italy
关键词
accretion; general relativity; QPOs; X-rays : binaries; X-rays : individual;
D O I
10.1093/pasj/55.2.467
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
We have explored the ideas that parametric resonance affects nearly geodesic motion around a black hole or a neutron star, and that it may be relevant to the high-frequency (twin) quasi-periodic oscillations that occur in some low-mass X-ray binaries. We have assumed the particles or fluid elements of an accretion disc to be subject to an isotropic perturbation having a hypothetical but rather general form. We find that the parametric resonance is indeed excited close to the radius where epicyclic frequencies of the radial and meridional oscillations are in a 2 : 3 ratio. The location and frequencies of the highest amplitude excitation vary with the strength of the perturbation. These results agree with actual frequency ratios of twin kHz QPOs that have been reported in some black hole candidates, and they may be consistent also with correlation of the twin peaks in Sco X-1.
引用
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页码:467 / 471
页数:5
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