能量相关的粒子扩散对MKN 421 X射线谱曲率的影响
Influence of Energy-Dependent Particle Diffusion on the X-ray spectral curvature of MKN 421
摘要：
Blazar的X射线光谱曲率传统上用一个经验对数抛物线函数来解释，该函数由三个参数表征，即在给定能量下的通量、曲率和光谱指数。由于这些参数与潜在的物理量的确切关系尚不清楚，因此很难通过这些参数解释震源的物理情况。为了深入了解的X射线光谱形状，我们进行了详细的研究的X射线光谱的耀变体MKN 421，使用的分析模型，从粒子加速网站的电子扩散是能量依赖的。由此产生的同步加速器光谱再次确定的三个参数，即，逃逸时间尺度的能量指数，连接电子能量的量观察到的光子能量和归一化。利用该模型研究了2012年7月至2013年4月期间NuSTAR和Swift-XRT对MKN 421的X射线观测，发现模型参数与观测量之间存在显著的相关性。此外，一个强的反相关性之间的拟合参数定义的光谱形状，这是不明显的，从早期的研究使用经验模型。这表明MKN 421和可能的其他耀变体的通量变化可能是由一个明确的物理过程引起的，需要进一步研究。
英文摘要：
The X-ray spectral curvature of blazars is traditionally explained by an empirical log-parabola function characterized by three parameters, namely the flux, curvature and spectral index at a given energy. Since their exact relationship with the underlying physical quantities is unclear, interpreting the physical scenario of the source through these parameters is difficult. To attain an insight on the X-ray spectral shape, we perform a detailed study of the X-ray spectra of the blazar MKN 421, using an analytical model where the electron diffusion from the particle acceleration site is energy-dependent. The resultant synchrotron spectrum is again determined by three parameters, namely, the energy index of the escape time scale, the quantity connecting the electron energy to the observed photon energy and the normalization. The X-ray observations of MKN 421, during July 2012 - April 2013 by NuSTAR and Swift-XRT are investigated using this model and we find a significant correlation between model parameters and the observational quantities. Additionally, a strong anti-correlation is found between the fit parameters defining the spectral shape, which was not evident from earlier studies using empirical models. This indicates the flux variations in MKN 421 and possibly other blazars, may arise from a definite physical process that needs to be further investigated.
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