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arXiv 1108.0540astro-ph.HE
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黑洞中的低频振荡:GX 339-4事例的谱定时方法

Low frequency oscillations in black holes: a spectral-timing approach to the case of GX 339-4

S. Motta, T. Muñoz-Darias, P. Casella, T. Belloni, J. Homan

摘要:

我们分析了瞬态黑洞双星GX 339-4的RXTE/PCA和HEXTE数据,这些数据是在8年的时间跨度内收集的。我们研究了低频准周期振荡(QPOs)的性质和行为的综合宽带可变性和光谱参数在四个爆发(2002年,2004年,2007年,2010年)的函数。大多数QPO可以按照之前提出的ABC分类进行分类。我们的研究结果表明,ABC分类可以扩展到包括光谱依赖性和三个QPO类型确实有本质上不同的属性。就QPO频率与幂律通量之间的关系而言,A型和C型QPO可能遵循相同的关系,而B型QPO则遵循非常不同的关系。B型QPO频率与幂律通量明显相关,并与计数率的局部增加有关。在2002年、2007年和2010年爆发的上升阶段观测到的所有QPO的频率与盘通量相关。我们的结果可以解释最近提出的QPO模型的框架内,涉及Lense-Thirring进动。我们认为,C型和A型QPO可能是相连的,可以解释为是在爆发演化的不同阶段观察到的相同现象的结果,而不同的物理过程产生B型QPO。

英文摘要:

We analyzed RXTE/PCA and HEXTE data of the transient black hole binary GX 339-4, col- lected over a time span of eight years. We studied the properties and the behavior of low frequency quasi periodic oscillations (QPOs) as a function of the integrated broad-band variability and the spectral parameters during four outbursts (2002, 2004, 2007, 2010). Most of the QPOs could be classified following the ABC classification that has been proposed before. Our results show that the ABC classification can be extended to include spectral dependencies and that the three QPO types have indeed intrinsically different properties. In terms of the relation between QPO frequency and power-law flux, type-A and -C QPOs may follow the same relation, whereas the type-B QPOs trace out a very different relation. Type-B QPO frequencies clearly correlate with the powerlaw-flux and are connected to local increases of the count rate. The frequency of all QPOs observed in the rising phase of the 2002, 2007 and 2010 outburst correlate with the disk flux. Our results can be interpreted within the framework of recently proposed QPO models involving Lense-Thirring precession. We suggest that type- C and -A QPOs might be connected and could be interpreted as being the result of the same phenomenon observed at different stages of the outburst evolution, while a different physical process produces type-B QPOs.

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