论文标题
半人马座的硬X射线排放
Hard X-ray emission in Centaurus A
论文作者
论文摘要
我们使用了13年的快速/蝙蝠观测来探测Centaurus A中硬X射线（14-195 keV）发射的性质和起源。自2004年Swift Operation的开始以来，检测到14-195 KeV频段的显着X射线变异性，并且源源频谱的变化略有变化。随着壮大的趋势，在2013年之后，光谱变化变得更加显着。使用功率谱密度方法，我们发现观察到的硬X射线光子通量变化与斜率红色噪声过程一致，$ -1.3 $，没有证据表明PSD中断。我们发现硬X射线与230 GHz无线电通量变化之间存在显着相关性，没有时间延迟超过30天。时间和光谱分析排除了ADAF（以对流为主的积聚流）模型，并确认在无线电射流的内部区域产生了硬X射线发射。
We used 13 years of Swift/BAT observations to probe the nature and origin of hard X-ray (14-195 KeV) emission in Centaurus A. Since the beginning of the Swift operation in 2004, significant X-ray variability in the 14-195 KeV band is detected, with mild changes in the source spectrum. Spectral variations became more eminent after 2013, following a softer-when-brighter trend. Using the power spectral density method, we found that the observed hard X-ray photon flux variations are consistent with a red-noise process of slope, $-1.3$ with no evidence for a break in the PSD. We found a significant correlation between hard X-ray and 230 GHz radio flux variations, with no time delay longer than 30 days. The temporal and spectral analysis rules out the ADAF (advection-dominated accretion flow) model, and confirms that the hard X-ray emission is produced in the inner regions of the radio jet.
