论文标题
GX 339-4的截短盘和内部热流的演变
Evolution of the truncated disc and inner hot-flow of GX 339-4
论文作者
论文摘要
目标。我们通过分析从爆发末端进行的六个XMM-Newton观测值中提取的功率谱密度（PSD）来研究截短盘和GX 339-4的内部热流的几何形状的变化。 方法。在0.3-0.7 KeV中GX 339-4的PSD的理论模型开发了0.3-0.7 KeV（热门回响）和0.7-1.5 KeV（圆盘连续）的能量频段。该模型假设在特定半径上截断了标准积聚盘，其中其中有两个不同的热流动区：一个频谱柔软，另一个频谱硬。盘式 - 透明和热响声的效果被考虑在内。 结果。该模型成功地生产了传统的颠簸PSD配置文件，并为GX 339-4数据提供了良好的适用。发现截断半径从$ r _ {\ rm trc} $ $ \ sim $ 10到55 $ r _ {\ rm g} $增加，因为源亮度降低了，这强烈确认截断radius可以表征为亮度的函数。考虑到截断半径的先前测量值的巨大不确定性，我们的值大于从光谱分析中获得的值，但比Reverberation Lag分析所隐含的值要小。此外，在频谱上且柔软的两个内部热流动区的大小也从$ \ sim $ 5 $ 5到27 $ r _ {\ rm g} $，从$ \ sim $ 3 $ 3到26 $ r _ {\ r _ {\ rm g} $，随着磁通量的减少。我们发现，内部硬区域的径向范围总是大于软流量区域的范围，但相对较小的因素为$ \ sim $ 1.1-2.2
Aims. We study the changes in geometry of the truncated disc and the inner hot-flow of GX 339-4 by analyzing the Power SpectralDensity (PSD) extracted from six XMM-Newton observations taken at the very end of an outburst. Methods. A theoretical model of the PSD of GX 339-4 in the 0.3-0.7 keV (thermal reverberation dominated) and 0.7-1.5 keV (disc continuum dominated) energy bands is developed. The model assumes the standard accretion disc to be truncated at a specific radius, inside of which are two distinct hot-flow zones: one spectrally soft and the other spectrally hard. The effects of disc-fluctuations and thermal reverberation are taken into account. Results. This model successfully produces the traditional bumpy PSD profiles and provides good fits to the GX 339-4 data. The truncation radius is found to increase from $r_{\rm trc}$ $\sim$ 10 to 55 $r_{\rm g}$ as the source luminosity decreases, strongly confirming that the truncation radius can be characterized as a function of luminosity. Keeping in mind the large uncertainty in previous measurements of the truncation radius, our values are larger than some obtained from spectroscopic analysis, but smaller than those implied from reverberation lag analysis. Furthermore, the size of two inner hot-flow zones which are spectrally hard and spectrally soft are also growing from $\sim$ 5 to 27 $r_{\rm g}$ and from $\sim$ 3 to 26 $r_{\rm g}$, respectively, as the flux decreases. We find that the radial range of inner hard zone is always larger than the range of the soft hot-flow zone, but by a comparatively small factor of $\sim$ 1.1-2.2
