XTE J1701-462中水平分支振荡的吸积率无关性
The accretion rate independence of horizontal branch oscillation in XTE J1701-462
摘要：
我们研究了独特的中子星低质量X射线双星XTE J1701-462的时间和能谱特性。在假设HB/NB顶点作为吸积速率的参考位置之后，HB/NB顶点的水平分支振荡（HBO）大约为50 Hz。这表明高压氧与吸积速率或源强度无关。谱分析表明，HB/NB顶点的吸积率为$R_{\rm{in}}\propto\dot{M}_{\rm{Disk}}^{2.9\pm0.09}$，NB/FB顶点的吸积率为$R_{\rm{in}}\propto\dot{M}_{\rm{Disk}}^{1.7\pm0.06}$，说明HB/NB顶点和NB/FB顶点的吸积率不同。康普顿化分量可以用约束破幂律（CBPL）或nthComp拟合。与GX 17+2不同，HBO的频率与内盘半径呈正相关，这与Lense-Thirring进动模型的预测相矛盾。XTEJ 1701 -462在类Cyg相和类Sco相中，宽带噪声的转折频率与HBO的特征频率之间存在正相关关系，即W-K关系。观察到高压氧的频率与光子能量之间存在线性关系。此外，HBO的均方根值随着光子能量的增加而增加，直到~10 keV。在XTE J1701-462中讨论了高压氧可能起源于日冕。
英文摘要：
We study the temporal and energy spectral properties of the unique neutron star low-mass X-ray binary XTE J1701-462. After assuming the HB/NB vertex as a reference position of accretion rate, the horizontal branch oscillation (HBO) of the HB/NB vertex is roughly 50 Hz. It indicates that the HBO is independent with the accretion rate or the source intensity. The spectral analysis shows $R_{\rm{in}}\propto\dot{M}_{\rm{Disk}}^{2.9\pm0.09}$ in the HB/NB vertex and $R_{\rm{in}}\propto\dot{M}_{\rm{Disk}}^{1.7\pm0.06}$ in the NB/FB vertex, which implies that different accretion rate may be produced in the HB/NB vertex and the NB/FB vertex. The Comptonization component could be fitted by constrained broken power law (CBPL) or nthComp. Different with GX 17+2, the frequencies of HBO positively correlate with the inner disk radius, which contradict with the prediction of Lense-Thirring precession model. XTE J1701-462, both in the Cyg-like phase and in the Sco-like phase, follows a positive correlation between the break frequency of broad band noise and the characteristic frequency of HBO, which is called the W-K relation. An anticorrelation between the frequency of HBO and photon energy is observed. Moreover, the rms of HBO increases with photon energy till ~10 keV. We discuss the possible origin of HBO from corona in XTE J1701-462.
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