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arXiv 0809.3115astro-ph
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吸积黑洞中QPO的新模型:对微类星体GRS 1915+105的应用

A new model for QPOs in accreting black holes: application to the microquasar GRS 1915+105

J. Petri

摘要:

本文推广了Petri(2005 a,b)的观点,认为在低质量X射线双星中观测到的高频准周期振荡可以解释为吸积盘与致密天体施加的旋转非对称背景(引力或磁场)场的共振振荡。在这里,我们把这个一般的想法应用到黑洞双星。它是假设一个测试粒子经历了类似的参数共振机制,如一个在文件I和II中描述的,但现在的共振是由螺旋密度波之间的相互作用引起的吸积盘,激发接近最里面的稳定的圆形轨道,和垂直周转振荡。我们使用克尔时空几何推导出这个测试粒子的特征频率。在候选黑洞中,当两个最强共振的频率比等于3:2时,测试粒子的响应最大。最后,将我们的模型应用于微类星体GRS 1915+105,我们再现了几个HF-QPO的正确值。实际上,预测了功率谱时间分析中168/113/56/42/28 Hz特征的存在。此外,仅基于两个HF-QPO频率,我们的模型就能约束吸积黑洞的质量$M_{\rm BH}$和角动量$a_{\rm BH}$.

英文摘要:

(abridged) In this paper we extend the idea suggested previously by Petri (2005a,b) that the high frequency quasi-periodic oscillations observed in low-mass X-ray binaries may be explained as a resonant oscillation of the accretion disk with a rotating asymmetric background (gravitational or magnetic) field imposed by the compact object. Here, we apply this general idea to black hole binaries. It is assumed that a test particle experiences a similar parametric resonance mechanism such as the one described in paper I and II but now the resonance is induced by the interaction between a spiral density wave in the accretion disk, excited close to the innermost stable circular orbit, and vertical epicyclic oscillations. We use the Kerr spacetime geometry to deduce the characteristic frequencies of this test particle. The response of the test particle is maximal when the frequency ratio of the two strongest resonances is equal to 3:2 as observed in black hole candidates. Finally, applying our model to the microquasar GRS 1915+105, we reproduce the correct value of several HF-QPOs. Indeed the presence of the 168/113/56/42/28 Hz features in the power spectrum time analysis is predicted. Moreover, based only on the two HF-QPO frequencies, our model is able to constrain the mass $M_{\rm BH}$ and angular momentum $a_{\rm BH}$ of the accreting black hole.

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