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arXiv 1801.08552astro-ph.HE
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RXTE数据谱态与非线性特性的相关:致密天体周围四种不同吸积模式的可能观测证据

Correlating nonlinear properties with spectral states of RXTE data: Possible observational evidences for four different accretion modes around compact objects

Oluwashina Adegoke, Prasun Dhang, Banibrata Mukhopadhyay, M. C. Ramadevi, Debbijoy Bhattacharya

摘要:

通过对RXTE/PCA数据的时间序列分析,得到了致密源的非线性变化规律。根据时间类的变化,紧凑源表现出不同的非线性特征。有时,它们显示出低相关性/分形维数,但在其他类别或时间间隔,它们表现出随机性。这可能是因为致密物体周围的吸积流是一个涉及磁流体动力学的非线性广义相对论系统。然而,解决紧凑源的更传统的方法是分析其光谱状态。因此,问题出现了:当非线性性质与描述流的几何形状的相关传输机制相关时,非线性与流的基本光谱性质的连接是什么?目前的工作旨在解决这一问题。基于两个X射线双星GRS 1915+105和Sco X-1观测到的光谱和非线性(时间序列)性质之间的联系,我们试图根据已知的吸积类,即Keplerian盘、slim盘、平流主导吸积流(ADAF)和一般平流吸积流(GAAF)来诊断源的吸积模式。我们探讨了源随时间从一种吸积模式到其他吸积模式的可能转变。我们进一步认为,吸积率必须发挥重要作用,在这些模式之间的过渡。

英文摘要:

By analyzing the time series of RXTE/PCA data, the nonlinear variabilities of compact sources have been repeatedly established. Depending on the variation in temporal classes, compact sources exhibit different nonlinear features. Sometimes they show low correlation/fractal dimension, but in other classes or intervals of time they exhibit stochastic nature. This could be because the accretion flow around a compact object is a nonlinear general relativistic system involving magnetohydrodynamics. However, the more conventional way of addressing a compact source is the analysis of its spectral state. Therefore, the question arises: What is the connection of nonlinearity to the underlying spectral properties of the flow when the nonlinear properties are related to the associated transport mechanisms describing the geometry of the flow? The present work is aimed at addressing this question. Based on the connection between observed spectral and nonlinear (time series) properties of two X-ray binaries: GRS 1915+105 and Sco X-1, we attempt to diagnose the underlying accretion modes of the sources in terms of known accretion classes, namely, Keplerian disc, slim disc, advection dominated accretion flow (ADAF) and general advective accretion flow (GAAF). We explore the possible transition of the sources from one accretion mode to others with time. We further argue that the accretion rate must play an important role in transition between these modes.

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