Z源GX 5-1中耦合的HBO和NBO变化：内吸积盘作为QPO的位置
Coupled HBO and NBO variations in the Z source GX 5-1: inner accretion disk as the location of QPOs
摘要：
Z型源中水平分支振荡（HBO）和正常分支振荡（NBO）的同时耦合演化表明，HBO的产生与NBO有关，是由内吸积盘的物理/辐射性质的变化引起的，尽管缺乏实质性的光谱证据来支持这一点。在这封{ \it Letter}中，我们给出了对Z源GX~5-1的RXTE观测的分析结果，其中6 Hz NBO与51 Hz HBO同时被探测到。的强度和相关的功率密度谱的变化表明，HBO和NBO是强耦合的，从同一位置的内吸积盘起源。在低能带中没有HBO和NBO，均方根振幅随能量增加，它们之间的平滑过渡表明它们产生于吸积盘的热内部区域。基于光谱分析，我们发现了一个签名的变化或物理修改的内部磁盘前在耦合HBO和NBO的演变。我们探讨了各种模型来解释所观察到的现象，并提出NBO是隶属于厚/鼓起来的内部区域的吸积盘的振荡。
英文摘要：
The simultaneous and coupled evolution of horizontal branch oscillation (HBO) and normal branch oscillation (NBO) in Z-type sources suggests that the production of HBO is connected to NBO and is caused by changes in the physical/radiative properties of the inner accretion disk, although there is a lack of substantial spectral evidence to support this. In this {\it Letter}, we present the results of an analysis of a RXTE observation of a Z source GX~5-1, where the 6 Hz NBO is simultaneously detected along with a HBO at 51 Hz. The variations in the intensity and the associated power density spectrum indicate that the HBO and NBO are strongly coupled, originating from the same location in the inner accretion disk. The absence of HBO and NBO in the lower energy bands, an increase in the rms amplitude with energy and a smooth transition among them suggest that they are produced in the hot inner regions of the accretion disk. Based on a spectral analysis, we found a signature of changing or physically modified inner disk front during the coupled HBO and NBO evolution. We explore the various models to explain the observed phenomenon and propose that the NBO is affiliated to the oscillations in the thick/puffed-up inner region of the accretion disk.
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