黑洞暂现源XTE J1650-500在2001-2002年爆发期的时变现象

摘要

Using the data observed by Rossi X-ray Timing Explorer,a systematic study of temporal phenomena of the black-hole transient XTE J1650-500 in its 2001-2002 outburst is presented.By using the time lag in the Fourier frequency domain,three characteristic frequency ranges are analysed,namely the band limited noise,red noise,and QPOs (Quasi-Periodic Oscillations).The properties and evolution behaviour in these frequency ranges may be dominated by different accretion regions.It is commonly believed that the smaller timescale corresponds to the more inner region.The low-hard state and hard intermediate state are especially highlighted.Data analysed results are discussed in the framework of Lense-Thirring precession.Results are in favor of the perturbation propagation regime for explaining the observed time lags.Although the timing analysis in the frequency range of band limited noise and red noise is carried out,and a possibly existing break point is found,the model to explain them is still not established.More work is needed to understand the innermost accretion region.%采用RXTE (Rossi X-ray Timing Explorer)卫星数据研究了黑洞暂现源XTE J1650-500在2001-2002年爆发的时变现象.采用傅里叶频域上的时延分析方法,研究了该源在3个特征傅里叶频率范围—宽限噪声、红噪声及准周期振荡(Quasi-Periodic Oscillation,QPO)内的时变特征.这3个频率区间(时间尺度)的特征及演化行为可能分别由不同的吸积区域主导.一般认为时间尺度越小,对应吸积区域越靠内.由此结合黑洞爆发所处的吸积态讨论了所得的结果,给出了所得观测现象对吸积盘与吸积流的演化行为的观测限制.研究表明,扰动传播模型可以对QPO频率范围内的各种时变特征给出较好的解释,而宽限噪声和红噪声频率范围内的时变现象(包括对可能存在的拐点)尚无良好模型对应,人们对黑洞最内吸积区域的性质及其演化的认识有待提高.