论文标题
XTE J1118+480在2005年爆发期间的积聚流量特性
Accretion Flow Properties of XTE J1118+480 During Its 2005 Outburst
论文作者
论文摘要
我们使用RXTE PCA和HEXTE Instruments的档案数据在2005年爆发期间研究了银河短轨道瞬态黑洞XTE J1118+480的光谱和时间特性。具有物理两组分流（TCAF）模型的光谱分析使我们能够了解源的积聚流量。我们发现，XTE J1118+480的爆发是非常规的爆发，因为来源仅处于硬状态（HS）。我们的频谱分析表明，在整个爆发过程中，源源是低角度的低击球速率高度主导的。由于源在整个爆发过程中都活跃在无线电中，因此我们努力估计用TCAF模型从光谱分析中观察到的X射线排放中射流的X射线贡献。总X射线强度显示出与无线电和射流X射线通量相似的进化性质。这使我们能够将这种“爆发”定义为“爆发”。当射流活动消失时，总X射线通量也会消退。我们的详细频谱分析还表明，尽管源仅在爆发期间的HS中，但由于开普勒磁盘速率的缓慢上升，阶段频谱在晚期下降略有较高。
We study spectral and temporal properties of Galactic short orbital period transient black hole XTE J1118+480 during its 2005 outburst using archival data of RXTE PCA and HEXTE instruments in the combined energy range of $3-100$ keV. Spectral analysis with the physical two-component advective flow (TCAF) model allows us to understand the accretion flow properties of the source. We found that this outburst of XTE J1118+480 is an unconventional outburst as the source was only in the hard state (HS). Our spectral analysis suggests that during the entire outburst, the source was highly dominated by the low angular momentum sub-Keplerian halo rate. Since the source was active in radio throughout the outburst, we make an effort to estimate X-ray contribution of jets in total observed X-ray emissions from the spectral analysis with the TCAF model. The total X-ray intensity shows a similar nature of evolution as of radio and jet X-ray fluxes. This allowed us to define this `outburst' also as a jet dominated `outburst'. Total X-ray flux also found to subside when jet activity disappears. Our detailed spectral analysis also showed that although the source was only in the HS during the outburst, in the late declining phase spectrum became slightly softer due to the slow rise in the Keplerian disk rate.
