The quasi-periodic oscillations and very low frequency noise of Scorpius X-1 as transient chaos - A dripping handrail?
The quasi-periodic oscillations and very low frequency noise of Scorpius X-1 as transient chaos - A dripping handrail?
复制标题
Scorpius X-1 的准周期振荡和极低频噪声构成瞬态混沌 - 滴水的扶手？
DOI：
10.1086/186920
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发表时间：
1993
期刊：
影响因子：
--
通讯作者：
J. Imamura
中科院分区：
文献类型：
--
作者：
J. Scargle;T. Steiman;K. Young;D. Donoho;J. Crutchfield;J. Imamura
我们提出的证据表明，准周期振荡（QPO）和低频噪声（LFN）特性的许多吸积源是同一物理过程的不同方面。我们分析了一个长时间，高时间分辨率的EXOSAT观测Sco X-1。X射线的亮度在从毫秒到小时的时间尺度上随机变化。这种可变性的性质-作为量化与功率谱分析和新的小波技术，{\it scalegram} -同意与{\it滴水扶手}吸积模型，一个简单的动力系统，表现出{\it瞬态混沌}。在这个模型中，QPO和LFN都是由具有宽尺寸分布的斑点的辐射产生的，这是由热气体的吸积和随后的扩散造成的，其密度受到未指定的不稳定性的限制，低于阈值。
We present evidence that the quasi-periodic oscillations (QPO) and low frequency noise (LFN) characteristic of many accretion sources are different aspects of the same physical process. We analyzed a long, high time resolution EXOSAT observation of Sco X-1. The x-ray luminosity varies stochastically on time scales from milliseconds to hours. The nature of this variability -- as quantified with both power spectrum analysis and new wavelet technique, the {\it scalegram} - agrees well with the {\it dripping handrail} accretion model, a simple dynamical system which exhibits {\it transient chaos}. In this model both the QPO and LFN are produced by radiation from blobs with a wide size distribution, resulting from accretion and subsequent diffusion of hot gas, the density of which is limited by an unspecified instability to lie below a threshold.