论文标题
Maxi J1348-630中B型QPO的两个组件组合模型
A two-component Comptonisation model for the type-B QPO in MAXI J1348-630
论文作者
论文摘要
X射线中观察到的快速变异性的光谱定时分析是研究黑洞二进制中积聚/射血流的物理和几何特性的强大工具。 B型准周期振荡（QPO）的起源（QPO）主要在软中间状态下的黑洞候选物中观察到，与相对论射流产生的发射有关。在这种状态下，X射线频谱的特征是由于增生盘，铁发射线（6-7 KEV范围）引起的软热黑体发射，以及由于Corona或相对性射击本身中热电子源的反孔源散射而引起的幂律像硬质分量一样。最近，使用使用较好的观测值获得的观测值研究了Maxi J1348-630的光谱定时性。数据显示，在〜4.5 Hz处的强型B QPO在2-2.5 KEV处的参考频带中，分数RMS幅度增加，而分数RMS幅度增加。我们使用一个可变的复合化模型，该模型假设QPO频率下组成的X射线通量和电晕的物理参数的正弦相干振荡，以同时拟合该QPO的能量依赖性分数RMS幅度和相位滞后。我们表明，两个物理连接的组合区可以成功解释QPO在整个0.8-10 KEV能量范围内的辐射特性。
Spectral-timing analysis of the fast variability observed in X-rays is a powerful tool to study the physical and geometrical properties of the accretion/ejection flows in black-hole binaries. The origin of type-B quasi-periodic oscillations (QPO), predominantly observed in black-hole candidates in the soft-intermediate state, has been linked to emission arising from the relativistic jet. In this state, the X-ray spectrum is characterised by a soft-thermal blackbody-like emission due to the accretion disc, an iron emission line (in the 6-7 keV range), and a power-law like hard component due to Inverse-Compton scattering of the soft-photon source by hot electrons in a corona or the relativistic jet itself. The spectral-timing properties of MAXI J1348-630 have been recently studied using observations obtained with the NICER observatory. The data show a strong type-B QPO at ~4.5 Hz with increasing fractional rms amplitude with energy and positive lags with respect to a reference band at 2-2.5 keV. We use a variable-Comptonisation model that assumes a sinusoidal coherent oscillation of the Comptonised X-ray flux and the physical parameters of the corona at the QPO frequency, to fit simultaneously the energy-dependent fractional rms amplitude and phase lags of this QPO. We show that two physically-connected Comptonisation regions can successfully explain the radiative properties of the QPO in the full 0.8-10 keV energy range.
